[clang] [clang] Check constexpr int->enum conversions consistently. (PR #143034)

[Shafik Yaghmour via cfe-commits]

================
@@ -2513,6 +2513,9 @@ void testValueInRangeOfEnumerationValues() {
   // expected-error@-1 {{constexpr variable 'x2' must be initialized by a 
constant expression}}
   // expected-note@-2 {{integer value 8 is outside the valid range of values 
[-8, 7] for the enumeration type 'E1'}}
   E1 x2b = static_cast<E1>(8); // ok, not a constant expression context
+  static_assert(static_cast<E1>(8), "");
----------------
shafik wrote:

I guess these are the cases my previous checks missed?

https://github.com/llvm/llvm-project/pull/143034
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