[clang] [StaticAnalyzer] Fix InnerPointerBRVisitor to avoid repeated map scans (PR #185796)

[Benedek Kaibas via cfe-commits]

benedekaibas wrote:

> It looks like the `Analysis/inner-pointer.cpp` test fails. The PR must change the semantics of something. Could you look into this?

Thank you for pointing this out! I apologize for not catching the test failure before pushing the second time. I'll work on it and fix it.


https://github.com/llvm/llvm-project/pull/185796