[clang] [clang] Increase VecLib bitfield size to 4 bits in CodeGenOptions.def (PR #108804)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `libc-x86_64-debian-dbg-runtimes-build` running on `libc-x86_64-debian` while building `clang` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/78/builds/6198

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

```
Step 4 (annotate) failure: 'python ../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py ...' (failure)
...
  this target lists all files in that directory.  If you want multiple
  targets in the same directory, add PARTIAL_SOURCES_INTENDED to the target
  specification, though it is discouraged.

  Please update
  /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/clang/unittests/CodeGen/CMakeLists.txt


Call Stack (most recent call first):
  cmake/modules/LLVMProcessSources.cmake:62 (llvm_check_source_file_list)
  cmake/modules/AddLLVM.cmake:997 (llvm_process_sources)
  cmake/modules/AddLLVM.cmake:1052 (generate_llvm_objects)
  cmake/modules/AddLLVM.cmake:1742 (add_llvm_executable)
  /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/clang/unittests/CMakeLists.txt:23 (add_unittest)
  /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/clang/unittests/CodeGen/CMakeLists.txt:7 (add_clang_unittest)


-- Registering ExampleIRTransforms as a pass plugin (static build: OFF)
-- Registering Bye as a pass plugin (static build: OFF)
-- Failed to find LLVM FileCheck
-- Google Benchmark version: v0.0.0, normalized to 0.0.0
-- Enabling additional flags: -DINCLUDE_DIRECTORIES=/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/third-party/benchmark/include
-- Performing Test HAVE_THREAD_SAFETY_ATTRIBUTES -- success
-- Performing Test HAVE_GNU_POSIX_REGEX -- failed to compile
-- Performing Test HAVE_POSIX_REGEX -- success
-- Performing Test HAVE_STEADY_CLOCK -- success
-- Performing Test HAVE_PTHREAD_AFFINITY -- success
-- Configuring incomplete, errors occurred!
See also "/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/CMakeFiles/CMakeOutput.log".
See also "/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/CMakeFiles/CMakeError.log".
['cmake', '../llvm-project/llvm', '-GNinja', '-DCMAKE_C_COMPILER=clang', '-DCMAKE_CXX_COMPILER=clang++', '-DLLVM_ENABLE_RUNTIMES=libc', '-DCMAKE_BUILD_TYPE=Debug', '-DLLVM_ENABLE_PROJECTS=llvm;clang'] exited with return code 1.
The build step threw an exception...
Traceback (most recent call last):
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 164, in step
    yield
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 113, in main
    run_command(['cmake', os.path.join(source_dir, 'llvm')] + cmake_args)
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 179, in run_command
    util.report_run_cmd(cmd, cwd=directory)
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-zorg/zorg/buildbot/builders/annotated/util.py", line 49, in report_run_cmd
    subprocess.check_call(cmd, shell=shell, *args, **kwargs)
  File "/usr/lib/python3.11/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['cmake', '../llvm-project/llvm', '-GNinja', '-DCMAKE_C_COMPILER=clang', '-DCMAKE_CXX_COMPILER=clang++', '-DLLVM_ENABLE_RUNTIMES=libc', '-DCMAKE_BUILD_TYPE=Debug', '-DLLVM_ENABLE_PROJECTS=llvm;clang']' returned non-zero exit status 1.
@@@STEP_FAILURE@@@
@@@BUILD_STEP build libc@@@
Running: ninja libc
[1/339] Generating VCSRevision.h
[2/339] Generating VCSVersion.inc
[3/339] Building CXX object tools/llvm-config/CMakeFiles/llvm-config.dir/llvm-config.cpp.o
Step 5 (cmake) failure: cmake (failure)
...
  /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/clang/unittests/CodeGen/CMakeLists.txt:7 (add_clang_unittest)


CMake Error at cmake/modules/LLVMProcessSources.cmake:116 (message):
  Found erroneous configuration for source file SimulatedOverflowTest.cpp

  LLVM's build system enforces that all source files are added to a build
  target, that exactly one build target exists in each directory, and that
  this target lists all files in that directory.  If you want multiple
  targets in the same directory, add PARTIAL_SOURCES_INTENDED to the target
  specification, though it is discouraged.

  Please update
  /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/clang/unittests/CodeGen/CMakeLists.txt


Call Stack (most recent call first):
  cmake/modules/LLVMProcessSources.cmake:62 (llvm_check_source_file_list)
  cmake/modules/AddLLVM.cmake:997 (llvm_process_sources)
  cmake/modules/AddLLVM.cmake:1052 (generate_llvm_objects)
  cmake/modules/AddLLVM.cmake:1742 (add_llvm_executable)
  /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/clang/unittests/CMakeLists.txt:23 (add_unittest)
  /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/clang/unittests/CodeGen/CMakeLists.txt:7 (add_clang_unittest)
-- Registering ExampleIRTransforms as a pass plugin (static build: OFF)
-- Registering Bye as a pass plugin (static build: OFF)
-- Failed to find LLVM FileCheck
-- Google Benchmark version: v0.0.0, normalized to 0.0.0
-- Enabling additional flags: -DINCLUDE_DIRECTORIES=/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-project/third-party/benchmark/include
-- Performing Test HAVE_THREAD_SAFETY_ATTRIBUTES -- success
-- Performing Test HAVE_GNU_POSIX_REGEX -- failed to compile
-- Performing Test HAVE_POSIX_REGEX -- success
-- Performing Test HAVE_STEADY_CLOCK -- success
-- Performing Test HAVE_PTHREAD_AFFINITY -- success
-- Configuring incomplete, errors occurred!
See also "/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/CMakeFiles/CMakeOutput.log".
See also "/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/CMakeFiles/CMakeError.log".
['cmake', '../llvm-project/llvm', '-GNinja', '-DCMAKE_C_COMPILER=clang', '-DCMAKE_CXX_COMPILER=clang++', '-DLLVM_ENABLE_RUNTIMES=libc', '-DCMAKE_BUILD_TYPE=Debug', '-DLLVM_ENABLE_PROJECTS=llvm;clang'] exited with return code 1.
The build step threw an exception...
Traceback (most recent call last):
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 164, in step
    yield
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 113, in main
    run_command(['cmake', os.path.join(source_dir, 'llvm')] + cmake_args)
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 179, in run_command
    util.report_run_cmd(cmd, cwd=directory)
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-runtimes-build/llvm-zorg/zorg/buildbot/builders/annotated/util.py", line 49, in report_run_cmd
    subprocess.check_call(cmd, shell=shell, *args, **kwargs)
  File "/usr/lib/python3.11/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['cmake', '../llvm-project/llvm', '-GNinja', '-DCMAKE_C_COMPILER=clang', '-DCMAKE_CXX_COMPILER=clang++', '-DLLVM_ENABLE_RUNTIMES=libc', '-DCMAKE_BUILD_TYPE=Debug', '-DLLVM_ENABLE_PROJECTS=llvm;clang']' returned non-zero exit status 1.

```

</details>

https://github.com/llvm/llvm-project/pull/108804