Add a few more tests.

Author: efriedma-quic

clang/test/SemaCXX/builtin-is-constant-evaluated.cpp

@@ -156,6 +156,15 @@ namespace narrowing {
 }
 
 struct GH99680 {
-  static const int x = 1/(1-__builtin_is_constant_evaluated()); // expected-error {{in-class initializer for static data member is not a constant expression}} \
+  static const int x1 = 1/(1-__builtin_is_constant_evaluated()); // expected-error {{in-class initializer for static data member is not a constant expression}} \
     // expected-note {{division by zero}}
+  static const int x2 = __builtin_is_constant_evaluated();
+  static_assert(x2 == 1);
+  static const float x3 = 1/(1-__builtin_is_constant_evaluated());  // expected-error {{in-class initializer for static data member of type 'const float' requires 'constexpr' specifier}} \
+  // expected-note {{add 'constexpr'}} \
+  // expected-error {{in-class initializer for static data member is not a constant expression}} \
+  // expected-note {{division by zero}}
+  static const float x4 = __builtin_is_constant_evaluated(); // expected-error {{in-class initializer for static data member of type 'const float' requires 'constexpr' specifier}} \
+  // expected-note {{add 'constexpr'}}
+  static_assert(fold(x4 == 1));
 };