[clang] [analyzer] Remove some false negatives in StackAddrEscapeChecker (PR #125638)

[Michael Flanders via cfe-commits]

Flandini wrote:

@Xazax-hun, I pushed some more test cases. I can't think of any more tricky test cases that weren't already covered, but lmk if you see any areas with gaps.

https://github.com/llvm/llvm-project/pull/125638