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[NFCI][LoopUnrollAndJam] Changing LoopUnrollAndJamPass to a function pass.

Authored by Whitney on Jan 9 2020, 8:15 AM.

Description

[NFCI][LoopUnrollAndJam] Changing LoopUnrollAndJamPass to a function pass.

Summary: This patch changes LoopUnrollAndJamPass to a function pass, and
keeps the loops traversal order same as defined in
FunctionToLoopPassAdaptor LoopPassManager.h.

The next patch will change the loop traversal to outer to inner order,
so more loops can be transform.

Discussion in llvm-dev mailing list:
https://groups.google.com/forum/#!topic/llvm-dev/LF4rUjkVI2g
Reviewer: dmgreen, jdoerfert, Meinersbur, kbarton, bmahjour, etiotto
Reviewed By: dmgreen
Subscribers: hiraditya, zzheng, llvm-commits
Tag: LLVM
Differential Revision: https://reviews.llvm.org/D72230