Make two texts static in `ReplayInlineAdvisor` (#79489)

This commit makes two variables static.
That makes two buildbot tests pass with short string annotations.
I suspect that there may be use after end of life bug and it's fixed by
this change, but it requires confirmation.

Short string annotations PR (reverted):
- https://github.com/llvm/llvm-project/pull/79049

Tests fixed with this PR:
```
  LLVM :: Transforms/Inline/cgscc-inline-replay.ll 
  LLVM :: Transforms/SampleProfile/inline-replay.ll
```
Buildbot output:
https://lab.llvm.org/buildbot/#/builders/5/builds/40364/steps/9/logs/stdio

This PR does not resolve a problem with `Clang :: SemaCXX/builtins.cpp`,
related PR is:
- https://github.com/llvm/llvm-project/pull/79522