Handle profile mismatch correctly for SamplePGO.

Summary: Fix the bug when promoted call return type mismatches with the promoted function, we should not try to inline it. Otherwise it may lead to compiler crash.

Reviewers: davidxl, tejohnson, eraman

Reviewed By: tejohnson

Subscribers: llvm-commits, sanjoy

Differential Revision: https://reviews.llvm.org/D38018

llvm-svn: 313658