Fix diagnostic message

Author: ahatanak

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -8765,7 +8765,8 @@ def err_expected_callable_argument : Error<
 def note_building_builtin_dump_struct_call : Note<
   "in call to printing function with arguments '(%0)' while dumping struct">;
 def err_builtin_verbose_trap_arg : Error<
-  "argument to __builtin_verbose_trap must be a non-empty string literal">;
+  "argument to __builtin_verbose_trap must be a pointer to a non-empty constant "
+  "string">;
 
 def err_atomic_load_store_uses_lib : Error<
   "atomic %select{load|store}0 requires runtime support that is not "

clang/test/SemaCXX/verbose-trap.cpp

@@ -14,11 +14,11 @@ void f(const char * arg) {
   __builtin_verbose_trap("hello" "world");
   __builtin_verbose_trap(constMsg1);
   __builtin_verbose_trap(constMsg2);
-  __builtin_verbose_trap(""); // expected-error {{argument to __builtin_verbose_trap must be a non-empty string literal}}
+  __builtin_verbose_trap(""); // expected-error {{argument to __builtin_verbose_trap must be a pointer to a non-empty constant string}}
   __builtin_verbose_trap(); // expected-error {{too few arguments}}
-  __builtin_verbose_trap(0); // expected-error {{argument to __builtin_verbose_trap must be a non-empty string literal}}
+  __builtin_verbose_trap(0); // expected-error {{argument to __builtin_verbose_trap must be a pointer to a non-empty constant string}}
   __builtin_verbose_trap(1); // expected-error {{cannot initialize a parameter of type 'const char *' with}}
-  __builtin_verbose_trap(arg); // expected-error {{argument to __builtin_verbose_trap must be a non-empty string literal}}
+  __builtin_verbose_trap(arg); // expected-error {{argument to __builtin_verbose_trap must be a pointer to a non-empty constant string}}
   __builtin_verbose_trap(str);
   __builtin_verbose_trap(u8"hello");
 }