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

[JJ Marr via cfe-commits]

================
@@ -0,0 +1,43 @@
+//===--- AvoidPlatformSpecificFundamentalTypesCheck.h - clang-tidy -------*- C++
+//-*-===//
----------------
jj-marr wrote:

Done.

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