[clang] Parse attribute [[gnu::no_stack_protector]] (#75289)

This commit adds relative TableGen definitions to parse the
`[[gnu::no_stack_protector]]` attribute.

This PR addresses issue #75235.

Author: Lancern

clang/include/clang/Basic/Attr.td

@@ -2212,7 +2212,8 @@ def NotTailCalled : InheritableAttr {
 def : MutualExclusions<[AlwaysInline, NotTailCalled]>;
 
 def NoStackProtector : InheritableAttr {
-  let Spellings = [Clang<"no_stack_protector">, Declspec<"safebuffers">];
+  let Spellings = [Clang<"no_stack_protector">, CXX11<"gnu", "no_stack_protector">,
+                   C23<"gnu", "no_stack_protector">, Declspec<"safebuffers">];
   let Subjects = SubjectList<[Function]>;
   let Documentation = [NoStackProtectorDocs];
   let SimpleHandler = 1;

clang/test/Sema/no_stack_protector.c

@@ -1,4 +1,7 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c23 %s
+
+[[gnu::no_stack_protector]] void test1(void) {}
+[[clang::no_stack_protector]] void test2(void) {}
 
 void __attribute__((no_stack_protector)) foo(void) {}
 int __attribute__((no_stack_protector)) var; // expected-warning {{'no_stack_protector' attribute only applies to functions}}

clang/test/Sema/no_stack_protector.cpp

@@ -0,0 +1,5 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
+// expected-no-diagnostics
+
+[[gnu::no_stack_protector]] void test1() {}
+[[clang::no_stack_protector]] void test2() {}