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

[Mariya Podchishchaeva via cfe-commits]

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@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -fsyntax-only -Wshift-bool -verify %s
+
+void t() {
+  int x = 10;
+  bool y = true;
+
+  bool a = y >> x;     // expected-warning {{right shifting a `bool` implicitly converts it to 'int'}}
+  bool b = false >> x; // expected-warning {{right shifting a `bool` implicitly converts it to 'int'}}
+  bool c = y >> 5;     // expected-warning {{right shifting a `bool` implicitly converts it to 'int'}}
+  bool d = y >> -1;    // expected-warning {{right shifting a `bool` implicitly converts it to 'int'}}
+  bool e = y >> 0;     // expected-warning {{right shifting a `bool` implicitly converts it to 'int'}}
----------------
Fznamznon wrote:

Can we also check that clang doesn't warn on left shift? Can we also add a test checking something like
```
if ((y >> 2)  != 7) // expected-warning
```

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