[clang] [Sema] Fix -Wunreachable-code false negative when operands differ only by implicit casts (PR #149972)

[Aaron Ballman via cfe-commits]

================
@@ -1160,8 +1160,11 @@ class CFGBuilder {
       return {};
 
     // Check that it is the same variable on both sides.
-    if (!Expr::isSameComparisonOperand(DeclExpr1, DeclExpr2))
-      return {};
+    if (!Expr::isSameComparisonOperand(DeclExpr1, DeclExpr2)) {
+      if (!Expr::isSameComparisonOperand(DeclExpr1->IgnoreParenImpCasts(),
+                                         DeclExpr2->IgnoreParenImpCasts()))
+        return {};
----------------
AaronBallman wrote:

This doesn't seem correct to me; `isSameComparisonOperand` explicitly handles 
implicit cast expressions, so stripping them off here seems like the wrong 
place to handle this.

https://github.com/llvm/llvm-project/pull/149972
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