Revert "[MachinePipeliner] Split MachinePipeliner code into header and cpp files"

This reverts commit 40760b733d9eef841c897338af5e9d81b12551bf.
It seems that the commit is a cuse of the build failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345032 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed