[clang][ASTImporter] IdentifierInfo of Attribute should be set using 'ToASTContext' (#73290)

Co-authored-by: huqizhi <836744285@qq.com>

Author: jcsxky

clang/include/clang/Basic/AttributeCommonInfo.h

@@ -177,6 +177,7 @@ class AttributeCommonInfo {
                 IsRegularKeywordAttribute);
   }
   const IdentifierInfo *getAttrName() const { return AttrName; }
+  void setAttrName(const IdentifierInfo *AttrNameII) { AttrName = AttrNameII; }
   SourceLocation getLoc() const { return AttrRange.getBegin(); }
   SourceRange getRange() const { return AttrRange; }
   void setRange(SourceRange R) { AttrRange = R; }

clang/lib/AST/ASTImporter.cpp

@@ -9073,6 +9073,7 @@ class AttrImporter {
 
     ToAttr = FromAttr->clone(Importer.getToContext());
     ToAttr->setRange(ToRange);
+    ToAttr->setAttrName(Importer.Import(FromAttr->getAttrName()));
   }
 
   // Get the result of the previous import attempt (can be used only once).

clang/unittests/AST/ASTImporterTest.cpp

@@ -12,6 +12,7 @@
 
 #include "clang/AST/RecordLayout.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/Testing/CommandLineArgs.h"
 #include "llvm/Support/SmallVectorMemoryBuffer.h"
 
 #include "clang/AST/DeclContextInternals.h"
@@ -7379,11 +7380,12 @@ struct ImportAttributes : public ASTImporterOptionSpecificTestBase {
   }
 
   template <class DT, class AT>
-  void importAttr(const char *Code, AT *&FromAttr, AT *&ToAttr) {
+  void importAttr(const char *Code, AT *&FromAttr, AT *&ToAttr,
+                  TestLanguage Lang = Lang_CXX11) {
     static_assert(std::is_base_of<Attr, AT>::value, "AT should be an Attr");
     static_assert(std::is_base_of<Decl, DT>::value, "DT should be a Decl");
 
-    Decl *FromTU = getTuDecl(Code, Lang_CXX11, "input.cc");
+    Decl *FromTU = getTuDecl(Code, Lang, "input.cc");
     DT *FromD =
         FirstDeclMatcher<DT>().match(FromTU, namedDecl(hasName("test")));
     ASSERT_TRUE(FromD);
@@ -7669,6 +7671,13 @@ TEST_P(ImportAttributes, ImportLocksExcluded) {
   checkImportVariadicArg(FromAttr->args(), ToAttr->args());
 }
 
+TEST_P(ImportAttributes, ImportC99NoThrowAttr) {
+  NoThrowAttr *FromAttr, *ToAttr;
+  importAttr<FunctionDecl>("void test () __attribute__ ((__nothrow__));",
+                           FromAttr, ToAttr, Lang_C99);
+  checkImported(FromAttr->getAttrName(), ToAttr->getAttrName());
+}
+
 template <typename T>
 auto ExtendWithOptions(const T &Values, const std::vector<std::string> &Args) {
   auto Copy = Values;