[PATCH] D139233: [-Wunsafe-buffer-usage] Add an unsafe gadget for pointer-arithmetic operations

[Ziqing Luo via Phabricator via cfe-commits]

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For `-Wunsafe-buffer-usage` diagnostics, we want to warn about pointer arithmetics since resulting pointers can be used to access buffers.
Therefore, I add an `UnsafeGadget` representing general pointer arithmetic operations.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139233

Files:
  clang/include/clang/Analysis/Analyses/UnsafeBufferUsageGadgets.def
  clang/lib/Analysis/UnsafeBufferUsage.cpp
  clang/test/SemaCXX/warn-unsafe-buffer-usage.cpp

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