[clang] [clang][x86] Add initial constexpr support for VPOPCNTDQ intrinsics (PR #118017)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/171/builds/11280

<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)
...
[==========] Running 4 tests from 1 test suite.
[ RUN      ] LlvmLibcHashTest.SanityCheck
[       OK ] LlvmLibcHashTest.SanityCheck (17 ms)
[ RUN      ] LlvmLibcHashTest.Avalanche
[       OK ] LlvmLibcHashTest.Avalanche (2067 ms)
[ RUN      ] LlvmLibcHashTest.UniformLSB
[       OK ] LlvmLibcHashTest.UniformLSB (203 ms)
[ RUN      ] LlvmLibcHashTest.UniformMSB
[       OK ] LlvmLibcHashTest.UniformMSB (138 us)
Ran 4 tests.  PASS: 4  FAIL: 0
command timed out: 1200 seconds without output running [b'python', b'../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py', b'--debug', b'--asan'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1262.162928
Step 8 (libc-unit-tests) failure: libc-unit-tests (failure)
...
[ RUN      ] LlvmLibcStrtoint64Test.InvalidBase
[       OK ] LlvmLibcStrtoint64Test.InvalidBase (16 us)
[ RUN      ] LlvmLibcStrtoint64Test.CleanBaseTenDecode
[       OK ] LlvmLibcStrtoint64Test.CleanBaseTenDecode (14 us)
[ RUN      ] LlvmLibcStrtoint64Test.MessyBaseTenDecode
[       OK ] LlvmLibcStrtoint64Test.MessyBaseTenDecode (10 us)
[ RUN      ] LlvmLibcStrtoint64Test.DecodeInOtherBases
[       OK ] LlvmLibcStrtoint64Test.DecodeInOtherBases (413 ms)
[ RUN      ] LlvmLibcStrtoint64Test.CleanBaseSixteenDecode
[       OK ] LlvmLibcStrtoint64Test.CleanBaseSixteenDecode (7 us)
[ RUN      ] LlvmLibcStrtoint64Test.MessyBaseSixteenDecode
[       OK ] LlvmLibcStrtoint64Test.MessyBaseSixteenDecode (3 us)
[ RUN      ] LlvmLibcStrtoint64Test.AutomaticBaseSelection
[       OK ] LlvmLibcStrtoint64Test.AutomaticBaseSelection (5 us)
[ RUN      ] LlvmLibcStrtouint64Test.InvalidBase
[       OK ] LlvmLibcStrtouint64Test.InvalidBase (12 us)
[ RUN      ] LlvmLibcStrtouint64Test.CleanBaseTenDecode
[       OK ] LlvmLibcStrtouint64Test.CleanBaseTenDecode (7 us)
[ RUN      ] LlvmLibcStrtouint64Test.MessyBaseTenDecode
[       OK ] LlvmLibcStrtouint64Test.MessyBaseTenDecode (6 us)
[ RUN      ] LlvmLibcStrtouint64Test.DecodeInOtherBases
[       OK ] LlvmLibcStrtouint64Test.DecodeInOtherBases (233 ms)
[ RUN      ] LlvmLibcStrtouint64Test.CleanBaseSixteenDecode
[       OK ] LlvmLibcStrtouint64Test.CleanBaseSixteenDecode (8 us)
[ RUN      ] LlvmLibcStrtouint64Test.MessyBaseSixteenDecode
[       OK ] LlvmLibcStrtouint64Test.MessyBaseSixteenDecode (4 us)
[ RUN      ] LlvmLibcStrtouint64Test.AutomaticBaseSelection
[       OK ] LlvmLibcStrtouint64Test.AutomaticBaseSelection (4 us)
Ran 14 tests.  PASS: 14  FAIL: 0
[1096/1098] Running unit test libc.test.src.time.nanosleep_test.__unit__
[==========] Running 1 test from 1 test suite.
[ RUN      ] LlvmLibcNanosleep.SmokeTest
[       OK ] LlvmLibcNanosleep.SmokeTest (104 us)
Ran 1 tests.  PASS: 1  FAIL: 0
[1097/1098] Running unit test libc.test.src.__support.hash_test.__unit__
[==========] Running 4 tests from 1 test suite.
[ RUN      ] LlvmLibcHashTest.SanityCheck
[       OK ] LlvmLibcHashTest.SanityCheck (17 ms)
[ RUN      ] LlvmLibcHashTest.Avalanche
[       OK ] LlvmLibcHashTest.Avalanche (2067 ms)
[ RUN      ] LlvmLibcHashTest.UniformLSB
[       OK ] LlvmLibcHashTest.UniformLSB (203 ms)
[ RUN      ] LlvmLibcHashTest.UniformMSB
[       OK ] LlvmLibcHashTest.UniformMSB (138 us)
Ran 4 tests.  PASS: 4  FAIL: 0

command timed out: 1200 seconds without output running [b'python', b'../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py', b'--debug', b'--asan'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1262.162928

```

</details>

https://github.com/llvm/llvm-project/pull/118017