[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 `llvm-clang-x86_64-sie-ubuntu-fast` running on `sie-linux-worker` while building `clang` at step 4 "cmake-configure".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/144/builds/7339

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

```
Step 4 (cmake-configure) failure: cmake (failure)
...
  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/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/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/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/unittests/CMakeLists.txt:23 (add_unittest)
  /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/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/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/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/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/unittests/CMakeLists.txt:23 (add_unittest)
  /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/unittests/CodeGen/CMakeLists.txt:7 (add_clang_unittest)


-- Failed to find LLVM FileCheck
-- Google Benchmark version: v0.0.0, normalized to 0.0.0
-- 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/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/CMakeFiles/CMakeOutput.log".
See also "/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/CMakeFiles/CMakeError.log".

```

</details>

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