[clang-tools-extra] [clang-tidy] Improve `google-explicit-constructor` checks handling of `explicit(bool)` (PR #82689)

[Piotr Zegar via cfe-commits]

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@@ -79,8 +79,10 @@ static bool isStdInitializerList(QualType Type) {
 }
 
 void ExplicitConstructorCheck::check(const MatchFinder::MatchResult &Result) {
-  constexpr char WarningMessage[] =
+  constexpr char NoExpressionWarningMessage[] =
       "%0 must be marked explicit to avoid unintentional implicit conversions";
+  constexpr char WithExpressionWarningMessage[] =
+      "%0 explicit expression evaluated to false";
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PiotrZSL wrote:

Maybe ? ```evaluates to `false` ```

https://github.com/llvm/llvm-project/pull/82689