[clang] Add support for builtin_verbose_trap (PR #79230)

[Konstantin Varlamov via cfe-commits]

================
@@ -0,0 +1,28 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fcxx-exceptions -verify %s
+
+#if !__has_builtin(__builtin_verbose_trap)
+#error
+#endif
+
+constexpr char const* constMsg1 = "hello";
+char const* const constMsg2 = "hello";
+char const constMsg3[] = "hello";
+
+template <const char * const str>
+void f(const char * arg) {
+  __builtin_verbose_trap("Argument_must_not_be_null");
----------------
var-const wrote:

+1. Can we also check:
1. A non-ASCII Unicode character?
2. A long string (is there any limitation on the string length?)?

https://github.com/llvm/llvm-project/pull/79230