Invoke GetInlineCost for legality check before inline functions in SampleProfileLoader.

Invoke GetInlineCost for legality check before inline functions in SampleProfileLoader.

Summary: SampleProfileLoader inlines hot functions if it is inlined in the profiled binary. However, the inline needs to be guarded by legality check, otherwise it could lead to correctness issues.

Reviewers: eraman, davidxl

Reviewed By: eraman

Subscribers: sanjoy, llvm-commits

Differential Revision: https://reviews.llvm.org/D37779

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313195 91177308-0d34-0410-b5e6-96231b3b80d8