[clang] [clang-tools-extra] [clang-tidy] Add portability-avoid-platform-specific-fundamental-types (PR #146970)

[via cfe-commits]

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+//===--- AvoidPlatformSpecificFundamentalTypesCheck.cpp - clang-tidy ------===//
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EugeneZelenko wrote:

```suggestion
//===----------------------------------------------------------------------===//
```

Emacs tags a no longer needed. See #153942.

https://github.com/llvm/llvm-project/pull/146970