[CSSPGO] Relax size limitation for priority inlining with preinlined profile

As a follow-up to D124632, I'm turning on unlimited size caps for inlining with preinlined profile. It should be safe as a preinlined profile has "bounded" inline contexts.

No noticeable size or perf delta was seen with two of our internal large services, but I think this is still a good change to be consistent with the other case.

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D124793