[PATCH] D107960: [clang][analyzer] Make ReturnPtrRange checker warn at negative index.

[Balázs Kéri via Phabricator via cfe-commits]

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The checker did not work with negative array index at return.
Specially for -1 it did not produce a bug.
`assumeInBound` may not work correct with negative values so a pre-
check is added to the checker for negative array index.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D107960

Files:
  clang/lib/StaticAnalyzer/Checkers/ReturnPointerRangeChecker.cpp
  clang/test/Analysis/return-ptr-range.cpp

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