[clang] [clang] implement current direction of CWG2765 for string literal comparisons in constant evaluation (PR #109208)

[Richard Smith via cfe-commits]

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@@ -1306,3 +1306,18 @@ constexpr int field(int a) {
 static_assert(field(3), ""); // expected-error {{constant expression}} \
                              // expected-note {{in call to 'field(3)'}}
 }
+
+namespace literal_comparison {
+
+constexpr bool different_in_loop(bool b = false) {
+  if (b) return false;
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zygoloid wrote:

Just to suppress the "constexpr function never produces a constant expression" diagnostic.

https://github.com/llvm/llvm-project/pull/109208