[clang-tools-extra] [clang-tidy] Detect std::rot[lr] pattern within modernize.use-std-bit (PR #186324)

[Victor Chernyakin via cfe-commits]

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@@ -195,3 +195,59 @@ unsigned invalid_popcount_bitset(unsigned x, signed y) {
   };
 }
 
+
+/*
+ * rotate patterns
+ */
+unsigned char rotate_left_pattern(unsigned char x) {
+  // CHECK-MESSAGES: :[[@LINE+2]]:10: warning: use 'std::rotl' instead [modernize-use-std-bit]
+  // CHECK-FIXES: return (int)std::rotl(x, 3);
+  return x << 3 | x >> 5;
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localspook wrote:

Can we add tests where...
- the args are parenthesized? i.e. `(x << 3) | (x >> 5)`
- we rotate a variable wider than a byte?

https://github.com/llvm/llvm-project/pull/186324