[clang-tools-extra] [clang-tidy] Fix false positive in misc-redundant-expression with type aliases (PR #198085)

[Vassil Vassilev via cfe-commits]

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@@ -44,6 +45,328 @@ static bool incrementWithoutOverflow(const APSInt &Value, APSInt &Result) {
   return Value < Result;
 }
 
+static bool areEquivalentExpr(const Expr *Left, const Expr *Right);
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vgvassilev wrote:

Don't we have similar facilities in clang which we can reuse?

https://github.com/llvm/llvm-project/pull/198085