[llvm] Reland "[NFC] Move DroppedVariableStats to its own file and redesign it to be extensible (#118546)" (PR #119048)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-s390x-linux-multistage` running on `systemz-1` while building `llvm-project,llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/98/builds/781

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'libFuzzer-s390x-default-Linux :: fuzzer-timeout.test' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/./bin/clang    -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta   --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/lib/fuzzer  /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/TimeoutTest.cpp -o /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest
+ /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/./bin/clang -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/lib/fuzzer /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/TimeoutTest.cpp -o /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest
RUN: at line 2: /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/./bin/clang    -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta   --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/lib/fuzzer  /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/TimeoutEmptyTest.cpp -o /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutEmptyTest
+ /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/./bin/clang -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/lib/fuzzer /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/TimeoutEmptyTest.cpp -o /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutEmptyTest
RUN: at line 3: not  /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 2>&1 | FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=TimeoutTest
+ not /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1
+ FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=TimeoutTest
/home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test:7:14: error: TimeoutTest: expected string not found in input
TimeoutTest: #0
             ^
<stdin>:21:44: note: scanning from here
==3646604== ERROR: libFuzzer: timeout after 1 seconds
                                           ^
<stdin>:26:104: note: possible intended match here
AddressSanitizer: CHECK failed: asan_report.cpp:199 "((current_error_.kind)) == ((kErrorKindInvalid))" (0x1, 0x0) (tid=3646604)
                                                                                                       ^

Input file: <stdin>
Check file: /home/uweigand/sandbox/buildbot/clang-s390x-linux-multistage/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test

-dump-input=help explains the following input dump.

Input was:
<<<<<<
           .
           .
           .
          16: MS: 1 InsertByte-; base unit: 94dd9e08c129c785f7f256e82fbe0a30e6d1ae40 
          17: 0x48,0x69,0x21, 
          18: Hi! 
          19: artifact_prefix='./'; Test unit written to ./timeout-c0a0ad26a634840c67a210fefdda76577b03a111 
          20: Base64: SGkh 
          21: ==3646604== ERROR: libFuzzer: timeout after 1 seconds 
check:7'0                                                X~~~~~~~~~~ error: no match found
          22: AddressSanitizer:DEADLYSIGNAL 
check:7'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          23: ================================================================= 
check:7'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          24: AddressSanitizer:DEADLYSIGNAL 
check:7'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          25: ================================================================= 
check:7'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          26: AddressSanitizer: CHECK failed: asan_report.cpp:199 "((current_error_.kind)) == ((kErrorKindInvalid))" (0x1, 0x0) (tid=3646604) 
check:7'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:7'1                                                                                                            ?                         possible intended match
...

```

</details>

https://github.com/llvm/llvm-project/pull/119048