[llvm] [RISCV] Use named sub-operands to simplify encoding/decoding for CoreV Reg-Reg instructions. (PR #133181)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-ubuntu` running on `linaro-lldb-aarch64-ubuntu` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/14993

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: lang/cpp/break-on-initializers/TestBreakOnCPP11Initializers.py (757 of 2110)
PASS: lldb-api :: lang/cpp/bool/TestCPPBool.py (758 of 2110)
PASS: lldb-api :: lang/cpp/bitfields/TestCppBitfields.py (759 of 2110)
PASS: lldb-api :: lang/c/vla/TestVLA.py (760 of 2110)
PASS: lldb-api :: lang/cpp/class-loading-via-member-typedef/TestClassLoadingViaMemberTypedef.py (761 of 2110)
PASS: lldb-api :: lang/cpp/class-template-non-type-parameter-pack/TestClassTemplateNonTypeParameterPack.py (762 of 2110)
PASS: lldb-api :: lang/cpp/call-function/TestCallCPPFunction.py (763 of 2110)
PASS: lldb-api :: lang/cpp/chained-calls/TestCppChainedCalls.py (764 of 2110)
PASS: lldb-api :: lang/cpp/class-template-type-parameter-pack/TestClassTemplateTypeParameterPack.py (765 of 2110)
PASS: lldb-api :: lang/cpp/class-template-parameter-pack/TestClassTemplateParameterPack.py (766 of 2110)
FAIL: lldb-api :: lang/cpp/char1632_t/TestChar1632T.py (767 of 2110)
******************** TEST 'lldb-api :: lang/cpp/char1632_t/TestChar1632T.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --arch aarch64 --build-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/dsymutil --make /usr/bin/gmake --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/lang/cpp/char1632_t -p TestChar1632T.py
--
Exit Code: -11

Command Output (stdout):
--
lldb version 21.0.0git (https://github.com/llvm/llvm-project.git revision d58f57228d46a73059d507eef252a8dfae14f256)
  clang revision d58f57228d46a73059d507eef252a8dfae14f256
  llvm revision d58f57228d46a73059d507eef252a8dfae14f256
Skipping the following test categories: ['libc++', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_dsym (TestChar1632T.Char1632TestCase) (test case does not fall in any category of interest for this run) 
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_dwarf (TestChar1632T.Char1632TestCase)
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_dwo (TestChar1632T.Char1632TestCase)
----------------------------------------------------------------------
Ran 3 tests in 0.958s

OK (skipped=1)

--

********************
PASS: lldb-api :: lang/cpp/char8_t/TestCxxChar8_t.py (768 of 2110)
PASS: lldb-api :: lang/cpp/class-template-parameter-pack/TestTemplatePackArgs.py (769 of 2110)
PASS: lldb-api :: lang/cpp/complete-type-check/TestCppIsTypeComplete.py (770 of 2110)
PASS: lldb-api :: lang/cpp/const_static_integral_member_int128/TestConstStaticIntegralMemberInt128.py (771 of 2110)
PASS: lldb-api :: lang/cpp/class_static/TestStaticVariables.py (772 of 2110)
PASS: lldb-api :: lang/cpp/class_types/TestClassTypesDisassembly.py (773 of 2110)
PASS: lldb-api :: lang/cpp/const_this/TestConstThis.py (774 of 2110)
PASS: lldb-api :: lang/cpp/constructors/TestCppConstructors.py (775 of 2110)
PASS: lldb-api :: lang/cpp/crtp/TestCppCRTP.py (776 of 2110)
PASS: lldb-api :: lang/cpp/covariant-return-types/TestCovariantReturnTypes.py (777 of 2110)

```

</details>

https://github.com/llvm/llvm-project/pull/133181