[llvm] [Support] Remove cl::bits (PR #226628)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-linux-abi-test` running on `sie-linux-worker2` while building `llvm` at step 6 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/8/builds/34872

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

```
Step 6 (build-unified-tree) failure: build (failure)
...
3739.246 [1600/10/6407] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/ASTMatchers/ASTMatchersNodeTest.cpp.o
3741.075 [1599/10/6408] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTDumperTest.cpp.o
3744.800 [1598/10/6409] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTImporterFixtures.cpp.o
3747.406 [1597/10/6410] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTExprTest.cpp.o
3747.470 [1596/10/6411] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTVectorTest.cpp.o
3750.575 [1595/10/6412] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTImporterObjCTest.cpp.o
3750.621 [1594/10/6413] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/CommentLexer.cpp.o
3750.686 [1593/10/6414] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/CommentParser.cpp.o
3750.734 [1592/10/6415] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/CommentTextTest.cpp.o
3752.997 [1591/10/6416] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/ASTMatchers/ASTMatchersNarrowingTest.cpp.o
command timed out: 1200 seconds without output running [b'ninja'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=6218.746384

```

</details>

https://github.com/llvm/llvm-project/pull/226628