[clang] [analyzer] Delay the checker constructions after parsing (PR #127409)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat approved this pull request.

I'm happy to see this opportunity to improve the code quality :slightly_smiling_face:

I'm not familiar with the initialization procedure of the analyzer, but this change should affect every analysis run equally, so if you managed to run at least the `check-clang-analyzer` tests (which I presume), then the commit should be good to go.

https://github.com/llvm/llvm-project/pull/127409