[clang] [Clang] Permit implicit conversion from integral to boolean vectors (PR #158369)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `clang` at step 7 "test-build-unified-tree-check-flang-rt".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/39894

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

```
Step 7 (test-build-unified-tree-check-flang-rt) failure: 1200 seconds without output running [b'ninja', b'check-flang-rt'], attempting to kill
...
40.008 [2/8/33] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Numeric.cpp.o
40.215 [2/7/34] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/MatmulTranspose.cpp.o
40.365 [2/6/35] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ExternalIOTest.cpp.o
40.539 [2/5/36] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Complex.cpp.o
42.975 [2/4/37] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/NumericalFormatTest.cpp.o
48.065 [2/3/38] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Transformational.cpp.o
55.239 [2/2/39] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CharacterTest.cpp.o
82.761 [2/1/40] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Reduction.cpp.o
87.527 [1/1/41] Linking CXX executable flang-rt/unittests/Runtime/RuntimeTests
87.528 [0/1/41] Running the Flang-RT regression tests
command timed out: 1200 seconds without output running [b'ninja', b'check-flang-rt'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1300.832282

```

</details>

https://github.com/llvm/llvm-project/pull/158369