[clang] [clang] Add __has_feature(swiftcc) that checks whether the target supports the Swift calling convention (PR #72159)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kuba (Brecka) Mracek (kubamracek)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/72159.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/Features.def (+3) 


``````````diff
diff --git a/clang/include/clang/Basic/Features.def b/clang/include/clang/Basic/Features.def
index da77aee8de36990..f69d52a0c24f88e 100644
--- a/clang/include/clang/Basic/Features.def
+++ b/clang/include/clang/Basic/Features.def
@@ -99,6 +99,9 @@ FEATURE(memory_sanitizer,
 FEATURE(thread_sanitizer, LangOpts.Sanitize.has(SanitizerKind::Thread))
 FEATURE(dataflow_sanitizer, LangOpts.Sanitize.has(SanitizerKind::DataFlow))
 FEATURE(scudo, LangOpts.Sanitize.hasOneOf(SanitizerKind::Scudo))
+FEATURE(swiftcc,
+  PP.getTargetInfo().checkCallingConvention(CC_Swift) ==
+  clang::TargetInfo::CCCR_OK)
 FEATURE(swiftasynccc,
   PP.getTargetInfo().checkCallingConvention(CC_SwiftAsync) ==
   clang::TargetInfo::CCCR_OK)

``````````

</details>


https://github.com/llvm/llvm-project/pull/72159