[clang] [clang] Add an ABI_EXTENSION concept that is testable under -pedantic… (PR #153506)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions c,cpp -- clang/lib/Frontend/FrontendActions.cpp clang/lib/Lex/PPMacroExpansion.cpp clang/test/Sema/ptrauth-qualifier.c
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index c925e1f8a..cf988760b 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -1183,7 +1183,7 @@ void DumpCompilerOptionsAction::ExecuteAction() {
   OS << "\n\"extensions\" : [\n";
   {
     llvm::SmallString<128> Str;
-#define EXTENSION_OPTION(Name, Predicate)                                          \
+#define EXTENSION_OPTION(Name, Predicate)                                      \
   ("\t{\"" #Name "\" : " + llvm::Twine(Predicate ? "true" : "false") + "},\n") \
       .toVector(Str);
 #define EXTENSION(Name, Predicate) EXTENSION_OPTION(Name, Predicate)
diff --git a/clang/lib/Lex/PPMacroExpansion.cpp b/clang/lib/Lex/PPMacroExpansion.cpp
index 7cae6acc0..11814fd74 100644
--- a/clang/lib/Lex/PPMacroExpansion.cpp
+++ b/clang/lib/Lex/PPMacroExpansion.cpp
@@ -1118,7 +1118,7 @@ static bool HasExtension(const Preprocessor &PP, StringRef Extension) {
 #define ABI_EXTENSION(Name, Predicate) .Case(#Name, Predicate)
   bool IsABIExtension = llvm::StringSwitch<bool>(Extension)
 #include "clang/Basic/Features.def"
-      .Default(false);
+                            .Default(false);
 #undef ABI_EXTENSION
   if (IsABIExtension)
     return true;

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https://github.com/llvm/llvm-project/pull/153506