[clang] fix comment parsing of special commands with non-alphanumeric names. fixes #33296

Author: Brock Denson

clang/lib/AST/CommentLexer.cpp

@@ -214,7 +214,7 @@ bool isCommandNameStartCharacter(char C) {
 }
 
 bool isCommandNameCharacter(char C) {
-  return isAlphanumeric(C);
+  return isAsciiIdentifierContinue(C, false);
 }
 
 const char *skipCommandName(const char *BufferPtr, const char *BufferEnd) {

clang/test/AST/ast-dump-comment.cpp

@@ -131,3 +131,9 @@ void Test_TemplatedFunctionVariadic(int arg, ...);
 // CHECK:        ParamCommandComment{{.*}} [in] implicitly Param="..."
 // CHECK-NEXT:     ParagraphComment
 // CHECK-NEXT:       TextComment{{.*}} Text=" More arguments"
+
+/// \thread_safe test for underscore in special command
+int Test_UnderscoreInSpecialCommand;
+// CHECK:      VarDecl{{.*}}Test_UnderscoreInSpecialCommand 'int'
+// CHECK:        InlineCommandComment{{.*}} Name="thread_safe" RenderNormal
+// CHECK-NEXT:     TextComment{{.*}} Text=" test for underscore in special command"