[clang] [Clang] add -Wshift-bool warning to handle shifting of bool (PR #127336)

[Aaron Ballman via cfe-commits]

================
@@ -11246,6 +11246,12 @@ static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
   if (S.getLangOpts().OpenCL)
     return;
 
+  if (LHS.get()->IgnoreParenImpCasts()->getType()->isBooleanType()) {
+    S.Diag(Loc, diag::warn_shift_bool)
+        << (Opc == BO_Shr) /*left|right*/ << LHS.get()->getSourceRange();
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AaronBallman wrote:

I think we should only diagnose right shift (`bool >> val`) for now and not diagnose left shift (`bool << val`).

https://github.com/llvm/llvm-project/pull/127336