Add regression test

Author: alejandro-alvarez-sonarsource

clang/test/Sema/gh106576.c

@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+typedef _Atomic char atomic_char;
+
+typedef _Atomic char atomic_char;
+
+atomic_char counter;
+
+char load_plus_one(void) {
+  return ({counter;}) + 1; // no crash
+}
+
+char type_of_stmt_expr(void) {
+  typeof(({counter;})) y = ""; // expected-error-re {{incompatible pointer to integer conversion initializing 'typeof (({{{.*}}}))' (aka 'char') with an expression of type 'char[1]'}}
+  return y;
+}