[llvm] [EquivClasses] Fix signature of copy-assignment operator (PR #130140)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-hwasan` running on `sanitizer-buildbot12` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/55/builds/8118

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 86975 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 
FAIL: LLVM-Unit :: Support/./SupportTests/48/88 (79961 of 86975)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/48/88' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/unittests/Support/./SupportTests-LLVM-Unit-2661449-48-88.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=88 GTEST_SHARD_INDEX=48 /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/unittests/Support/./SupportTests
--

Note: This is test shard 49 of 88.
[==========] Running 16 tests from 16 test suites.
[----------] Global test environment set-up.
[----------] 1 test from CPUAlignBuildAttr
[ RUN      ] CPUAlignBuildAttr.testBuildAttr
[       OK ] CPUAlignBuildAttr.testBuildAttr (0 ms)
[----------] 1 test from CPUAlignBuildAttr (0 ms total)

[----------] 1 test from Caching
[ RUN      ] Caching.NoCommit
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/unittests/Support/Caching.cpp:145: Failure
Value of: bool(FileOrErr)
  Actual: false
Expected: true

Expected<T> must be checked before access or destruction.
Unchecked Expected<T> contained error:
No such file or directory: LLVMTestCache: Can't get a temporary file #0 0x0000c176d0d6b664 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Unix/Signals.inc:804:13
 #1 0x0000c176d0d661b8 llvm::sys::RunSignalHandlers() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Signals.cpp:106:18
 #2 0x0000c176d0d6c890 SignalHandler(int, siginfo_t*, void*) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
 #3 0x0000ece1011298f8 (linux-vdso.so.1+0x8f8)
 #4 0x0000ece100a57608 (/lib/aarch64-linux-gnu/libc.so.6+0x87608)
 #5 0x0000ece100a0cb3c raise (/lib/aarch64-linux-gnu/libc.so.6+0x3cb3c)
 #6 0x0000ece1009f7e00 abort (/lib/aarch64-linux-gnu/libc.so.6+0x27e00)
 #7 0x0000c176d0199274 operator<< /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/include/llvm/Support/raw_ostream.h:229:25
 #8 0x0000c176d0199274 operator<< /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/include/llvm/Support/raw_ostream.h:257:18
 #9 0x0000c176d0199274 llvm::Expected<std::__1::unique_ptr<llvm::CachedFileStream, std::__1::default_delete<llvm::CachedFileStream>>>::fatalUncheckedExpected() const /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/include/llvm/Support/Error.h:709:12
#10 0x0000c176d01983a8 operator() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/libcxx_install_hwasan/include/c++/v1/__functional/function.h:435:7
#11 0x0000c176d01983a8 operator() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/libcxx_install_hwasan/include/c++/v1/__functional/function.h:995:10
#12 0x0000c176d01983a8 Caching_NoCommit_Test::TestBody() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/unittests/Support/Caching.cpp:0:0
#13 0x0000c176d0da9bec os_stack_trace_getter /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/third-party/unittest/googletest/src/gtest.cc:6239:7
#14 0x0000c176d0da9bec testing::Test::Run() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/third-party/unittest/googletest/src/gtest.cc:2694:9
Step 11 (stage2/hwasan check) failure: stage2/hwasan check (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 86975 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 
FAIL: LLVM-Unit :: Support/./SupportTests/48/88 (79961 of 86975)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/48/88' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/unittests/Support/./SupportTests-LLVM-Unit-2661449-48-88.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=88 GTEST_SHARD_INDEX=48 /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/unittests/Support/./SupportTests
--

Note: This is test shard 49 of 88.
[==========] Running 16 tests from 16 test suites.
[----------] Global test environment set-up.
[----------] 1 test from CPUAlignBuildAttr
[ RUN      ] CPUAlignBuildAttr.testBuildAttr
[       OK ] CPUAlignBuildAttr.testBuildAttr (0 ms)
[----------] 1 test from CPUAlignBuildAttr (0 ms total)

[----------] 1 test from Caching
[ RUN      ] Caching.NoCommit
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/unittests/Support/Caching.cpp:145: Failure
Value of: bool(FileOrErr)
  Actual: false
Expected: true

Expected<T> must be checked before access or destruction.
Unchecked Expected<T> contained error:
No such file or directory: LLVMTestCache: Can't get a temporary file #0 0x0000c176d0d6b664 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Unix/Signals.inc:804:13
 #1 0x0000c176d0d661b8 llvm::sys::RunSignalHandlers() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Signals.cpp:106:18
 #2 0x0000c176d0d6c890 SignalHandler(int, siginfo_t*, void*) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
 #3 0x0000ece1011298f8 (linux-vdso.so.1+0x8f8)
 #4 0x0000ece100a57608 (/lib/aarch64-linux-gnu/libc.so.6+0x87608)
 #5 0x0000ece100a0cb3c raise (/lib/aarch64-linux-gnu/libc.so.6+0x3cb3c)
 #6 0x0000ece1009f7e00 abort (/lib/aarch64-linux-gnu/libc.so.6+0x27e00)
 #7 0x0000c176d0199274 operator<< /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/include/llvm/Support/raw_ostream.h:229:25
 #8 0x0000c176d0199274 operator<< /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/include/llvm/Support/raw_ostream.h:257:18
 #9 0x0000c176d0199274 llvm::Expected<std::__1::unique_ptr<llvm::CachedFileStream, std::__1::default_delete<llvm::CachedFileStream>>>::fatalUncheckedExpected() const /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/include/llvm/Support/Error.h:709:12
#10 0x0000c176d01983a8 operator() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/libcxx_install_hwasan/include/c++/v1/__functional/function.h:435:7
#11 0x0000c176d01983a8 operator() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/libcxx_install_hwasan/include/c++/v1/__functional/function.h:995:10
#12 0x0000c176d01983a8 Caching_NoCommit_Test::TestBody() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/unittests/Support/Caching.cpp:0:0
#13 0x0000c176d0da9bec os_stack_trace_getter /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/third-party/unittest/googletest/src/gtest.cc:6239:7
#14 0x0000c176d0da9bec testing::Test::Run() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/third-party/unittest/googletest/src/gtest.cc:2694:9

```

</details>

https://github.com/llvm/llvm-project/pull/130140