[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 `premerge-monolithic-linux` running on `premerge-linux-1` while building `clang` at step 5 "cmake-configure".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/9302

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

```
Step 5 (cmake-configure) failure: cmake (failure)
...
-- Performing Test CXX_SUPPORTS_NO_STRING_CONVERSION_FLAG - Success
-- Performing Test CXX_SUPPORTS_NO_CTAD_MAYBE_UNSUPPORTED_FLAG
-- Performing Test CXX_SUPPORTS_NO_CTAD_MAYBE_UNSUPPORTED_FLAG - Success
-- Not building omp_lib.mod, no OpenMP runtime in LLVM_ENABLED_PROJECTS
-- Not copying omp_lib.h, no OpenMP runtime in LLVM_ENABLED_PROJECTS
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) 
-- Targeting AArch64 in llvm-bolt
-- Targeting X86 in llvm-bolt
-- Targeting RISCV in llvm-bolt
-- Building BOLT runtime libraries for X86
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) 
-- ISL version: isl-0.25-193-g8621c60c
-- Registering Polly as a pass plugin (static build: ON)
-- Found Python3: /usr/bin/python3.10 (found version "3.10.12") found components: Interpreter 
-- libclc target 'amdgcn--' is enabled
--   device: tahiti ( pitcairn;verde;oland;hainan;bonaire;kabini;kaveri;hawaii;mullins;tonga;tongapro;iceland;carrizo;fiji;stoney;polaris10;polaris11;gfx602;gfx705;gfx805;gfx900;gfx902;gfx904;gfx906;gfx908;gfx909;gfx90a;gfx90c;gfx940;gfx941;gfx942;gfx1010;gfx1011;gfx1012;gfx1013;gfx1030;gfx1031;gfx1032;gfx1033;gfx1034;gfx1035;gfx1036;gfx1100;gfx1101;gfx1102;gfx1103;gfx1150;gfx1151;gfx1152;gfx1200;gfx1201 )
-- libclc target 'amdgcn--amdhsa' is enabled
--   device: none (  )
-- libclc target 'amdgcn-mesa-mesa3d' is enabled
--   device: tahiti ( pitcairn;verde;oland;hainan;bonaire;kabini;kaveri;hawaii;mullins;tonga;tongapro;iceland;carrizo;fiji;stoney;polaris10;polaris11;gfx602;gfx705;gfx805;gfx900;gfx902;gfx904;gfx906;gfx908;gfx909;gfx90a;gfx90c;gfx940;gfx941;gfx942;gfx1010;gfx1011;gfx1012;gfx1013;gfx1030;gfx1031;gfx1032;gfx1033;gfx1034;gfx1035;gfx1036;gfx1100;gfx1101;gfx1102;gfx1103;gfx1150;gfx1151;gfx1152;gfx1200;gfx1201 )
-- libclc target 'clspv--' is enabled
--   device: none (  )
-- libclc target 'clspv64--' is enabled
--   device: none (  )
-- libclc target 'nvptx--' is enabled
--   device: none (  )
-- libclc target 'nvptx--nvidiacl' is enabled
--   device: none (  )
-- libclc target 'nvptx64--' is enabled
--   device: none (  )
-- libclc target 'nvptx64--nvidiacl' is enabled
--   device: none (  )
-- libclc target 'r600--' is enabled
--   device: cedar ( palm;sumo;sumo2;redwood;juniper )
--   device: cypress ( hemlock )
--   device: barts ( turks;caicos )
--   device: cayman ( aruba )
-- 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=/build/buildbot/premerge-monolithic-linux/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 "/build/buildbot/premerge-monolithic-linux/build/CMakeFiles/CMakeOutput.log".
See also "/build/buildbot/premerge-monolithic-linux/build/CMakeFiles/CMakeError.log".

```

</details>

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