[clang] Add `pragma clang scope [push|pop]` (PR #121025)

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


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git-clang-format --diff 2c95e60df53ba1a5765b3fad9e8ddaff70f21994 5433a9134beb8faf1e2b662c96f76d7e8bc814de --extensions h,c,cpp -- clang/test/Lexer/Inputs/SomeHeaderThatDefinesAwfulThings.h clang/test/Lexer/pragma-scope.c clang/include/clang/Lex/Preprocessor.h clang/lib/Lex/PPMacroExpansion.cpp clang/lib/Lex/Pragma.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Lex/Preprocessor.h b/clang/include/clang/Lex/Preprocessor.h
index 96240533de..7d9292d072 100644
--- a/clang/include/clang/Lex/Preprocessor.h
+++ b/clang/include/clang/Lex/Preprocessor.h
@@ -1059,7 +1059,8 @@ private:
   /// Warning information for macro annotations.
   llvm::DenseMap<const IdentifierInfo *, MacroAnnotations> AnnotationInfos;
 
-  using MacroScopeVec = llvm::SmallVector<std::pair<IdentifierInfo *, MacroDirective *> >;
+  using MacroScopeVec =
+      llvm::SmallVector<std::pair<IdentifierInfo *, MacroDirective *>>;
   MacroScopeVec *CurScope = nullptr;
   llvm::SmallVector<MacroScopeVec> MacroScopeStack;
 
diff --git a/clang/lib/Lex/PPMacroExpansion.cpp b/clang/lib/Lex/PPMacroExpansion.cpp
index f47a2eb1a3..ecc37bbd01 100644
--- a/clang/lib/Lex/PPMacroExpansion.cpp
+++ b/clang/lib/Lex/PPMacroExpansion.cpp
@@ -80,9 +80,9 @@ void Preprocessor::popMacroScope(SourceLocation Loc) {
   for (auto It = CurScope->rbegin(); It != CurScope->rend(); ++It) {
     MacroDirective *Prev = It->second->getPrevious();
     if (Prev && Prev->getKind() == MacroDirective::MD_Define) {
-        DefMacroDirective *MD =
-            AllocateDefMacroDirective(Prev->getMacroInfo(), Loc);
-        appendMacroDirective(It->first, MD);
+      DefMacroDirective *MD =
+          AllocateDefMacroDirective(Prev->getMacroInfo(), Loc);
+      appendMacroDirective(It->first, MD);
     } else {
       UndefMacroDirective *Undef = AllocateUndefMacroDirective(Loc);
       appendMacroDirective(It->first, Undef);
@@ -105,7 +105,7 @@ void Preprocessor::appendMacroDirective(IdentifierInfo *II,
   StoredMD.overrideActiveModuleMacros(*this, II);
 
   if (CurScope)
-    CurScope->push_back(std::make_pair(II,MD));
+    CurScope->push_back(std::make_pair(II, MD));
 
   if (needModuleMacros()) {
     // Track that we created a new macro directive, so we know we should
@@ -1192,8 +1192,8 @@ static bool HasExtension(const Preprocessor &PP, StringRef Extension) {
       Extension.size() >= 4)
     Extension = Extension.substr(2, Extension.size() - 4);
 
-  // Because we inherit the feature list from HasFeature, this string switch
-  // must be less restrictive than HasFeature's.
+    // Because we inherit the feature list from HasFeature, this string switch
+    // must be less restrictive than HasFeature's.
 #define EXTENSION(Name, Predicate) .Case(#Name, Predicate)
   return llvm::StringSwitch<bool>(Extension)
 #include "clang/Basic/Features.def"

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https://github.com/llvm/llvm-project/pull/121025