[clang] [coverage] fix crash in code coverage and `if constexpr` with `ExprWithCleanups` (PR #80292)

[Hana Dusíková via cfe-commits]

================
@@ -234,6 +234,35 @@ constexpr int check_macro_consteval_if_skipped(int i) {   
// CHECK-NEXT: [[@LINE
   return i;
 }
 
+struct false_value {
+  constexpr operator bool() {
+    return false;
+  }
+};
+
+template <typename> struct dependable_false_value {
+  constexpr operator bool() {
+    return false;
+  }
+};
+
+// GH-80285
+void should_not_crash() {
+    if constexpr (false_value{}) { };
----------------
hanickadot wrote:

Thanks!

https://github.com/llvm/llvm-project/pull/80292
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