[clang] [Clang] Fix constexpr inc/dec operators for OverflowBehaviorTypes (PR #183826)

[Justin Stitt via cfe-commits]

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@@ -11,7 +11,7 @@ constexpr wrap_int add(wrap_int a, wrap_int b) {
 }
 
 constexpr no_trap_int sub(no_trap_int a, no_trap_int b) {
-  return a - b; // expected-note {{-2147483649 is outside the range of representable values}}
+  return a - b; // expected-note {{overflow on type 'no_trap_int' (aka '__ob_trap int') would trap at runtime}}
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JustinStitt wrote:

Tried to handle both yours and @ojhunt's feedback with [`586fd4a`](https://github.com/llvm/llvm-project/pull/183826/commits/586fd4a63c790b8b7c3bacb61e2815b3b54a1766). PTAL.

https://github.com/llvm/llvm-project/pull/183826