[clang] [clang][test] Split out staticanalyzer portion of Modules/specializations-lazy-load-parentmap-crash.cpp (PR #151259)

[Michael Jabbour via cfe-commits]

https://github.com/michael-jabbour-sonarsource commented:

LGTM. Thanks for fixing this.

I left two minor comments. Feel free to ignore if they are not relevant.

https://github.com/llvm/llvm-project/pull/151259