[llvm] [Sample Profile] Check hot callsite threshold when inlining a function with a sample profile (PR #93286)

[via llvm-commits]

WenleiHe wrote:

> > Internal load testing showed there's no regression, I am not sure if there is a public load test that uses sample profile (I am looking at https://llvm-compile-time-tracker.com/ but I don't think any uses it)
> 
> Internal test is fine.

Right, internal is fine, as long as it's testing typical scenario (not merged profile). Thanks for double checking. 

https://github.com/llvm/llvm-project/pull/93286