Remove InstructionCombining and its related pass from sample pgo passes as we...

Remove InstructionCombining and its related pass from sample pgo passes as we can handle "invoke" correctly.

Summary: We previously relies on InstructionCombining pass to remove invoke instructions. Now that we can inline invoke instructions correctly, we do not need these passes any more.

Reviewers: dnovillo

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D24730

llvm-svn: 281910