[clang] [clang]Implement the c23 stdc bit builtins (PR #185978)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/40771

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang-Unit :: ./AllClangUnitTests/23/51' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/Volumes/RAMDisk/buildbot-root/aarch64-darwin/build/tools/clang/unittests/./AllClangUnitTests-Clang-Unit-89940-23-51.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=51 GTEST_SHARD_INDEX=23 /Volumes/RAMDisk/buildbot-root/aarch64-darwin/build/tools/clang/unittests/./AllClangUnitTests
--

Script:
--
/Volumes/RAMDisk/buildbot-root/aarch64-darwin/build/tools/clang/unittests/./AllClangUnitTests --gtest_filter=TimeProfilerTest.ConstantEvaluationC99
--
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/clang/unittests/Support/TimeProfilerTest.cpp:366: Failure
Expected equality of these values:
  R"(
ExecuteCompiler
| Frontend (test.c)
| | ParseDeclarationOrFunctionDefinition (test.c:2:1)
| | | isIntegerConstantExpr (<test.c:3:18>)
| | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)
| PerformPendingInstantiations
)"
    Which is: "\nExecuteCompiler\n| Frontend (test.c)\n| | ParseDeclarationOrFunctionDefinition (test.c:2:1)\n| | | isIntegerConstantExpr (<test.c:3:18>)\n| | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)\n| PerformPendingInstantiations\n"
  buildTraceGraph(Json)
    Which is: "\nExecuteCompiler\n| Frontend (test.c)\n| | ParseDeclarationOrFunctionDefinition (test.c:2:1)\n| | | isIntegerConstantExpr (<test.c:3:18>)\n| | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)\n| | | PerformPendingInstantiations\n"
With diff:
@@ -5,3 +5,3 @@
 | | | isIntegerConstantExpr (<test.c:3:18>)
 | | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)
-| PerformPendingInstantiations\n
+| | | PerformPendingInstantiations\n



/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/clang/unittests/Support/TimeProfilerTest.cpp:366
Expected equality of these values:
  R"(
ExecuteCompiler
| Frontend (test.c)
| | ParseDeclarationOrFunctionDefinition (test.c:2:1)
| | | isIntegerConstantExpr (<test.c:3:18>)
| | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)
| PerformPendingInstantiations
)"
    Which is: "\nExecuteCompiler\n| Frontend (test.c)\n| | ParseDeclarationOrFunctionDefinition (test.c:2:1)\n| | | isIntegerConstantExpr (<test.c:3:18>)\n| | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)\n| PerformPendingInstantiations\n"
  buildTraceGraph(Json)
    Which is: "\nExecuteCompiler\n| Frontend (test.c)\n| | ParseDeclarationOrFunctionDefinition (test.c:2:1)\n| | | isIntegerConstantExpr (<test.c:3:18>)\n| | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)\n| | | PerformPendingInstantiations\n"
With diff:
@@ -5,3 +5,3 @@
 | | | isIntegerConstantExpr (<test.c:3:18>)
 | | | EvaluateKnownConstIntCheckOverflow (<test.c:3:18>)
-| PerformPendingInstantiations\n
...

```

</details>

https://github.com/llvm/llvm-project/pull/185978