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[LoopUnrollAndJam] Change LoopUnrollAndJamPass to LoopNest pass

Authored by maekawatoshiki <konndennsa@gmail.com> on May 27 2021, 9:17 AM.

Description

[LoopUnrollAndJam] Change LoopUnrollAndJamPass to LoopNest pass

This patch changes LoopUnrollAndJamPass from FunctionPass to LoopNest pass.
The next patch will utilize LoopNest to effectively handle loop nests.

Reviewed By: Whitney

Differential Revision: https://reviews.llvm.org/D99149