[clang-tools-extra] [clang-tidy][NFC] fix `clang-tidy` warnings in `clang-tools-extra/clang-tidy` directory (PR #136097)

[Baranov Victor via cfe-commits]

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@@ -209,12 +209,14 @@ bool isQualificationConvertiblePointer(QualType From, QualType To,
   // cv-decomposition of T, that is, cv_1, cv_2, ... , cv_n, is called the
   // cv-qualification signature of T.
 
-  auto isValidP_i = [](QualType P) {
+  // NOLINTNEXTLINE (readability-identifier-naming): Preserve original notation
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vbvictor wrote:

Here I changed the first letter to be capital as needed for naming-convention, but i needed to preserve last underscore (which is banned) since we have a big comment above, where they name variables like `P_n` : `cv_0 P_0 cv_1 P_1 ... cv_n−1 P_n−1 cv_n U” for n > 0`

https://github.com/llvm/llvm-project/pull/136097