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

[Mariya Podchishchaeva via cfe-commits]

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@@ -7115,6 +7115,9 @@ def warn_shift_result_sets_sign_bit : Warning<
   "signed shift result (%0) sets the sign bit of the shift expression's "
   "type (%1) and becomes negative">,
   InGroup<DiagGroup<"shift-sign-overflow">>, DefaultIgnore;
+def warn_shift_bool : Warning<
+  "%select{left|right}0 shifting a `bool` implicitly converts it to 'int'">,
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Fznamznon wrote:

I wonder if we should also suggest to change the shift to `b & !x` for right shifts?

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