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[Unroll] Add an option to control complete unrolling

Description

[Unroll] Add an option to control complete unrolling

Add an ability to specify the max full unroll count for LoopUnrollPass pass
in pass options.

Reviewers: fhahn, fedor.sergeev
Reviewed By: fedor.sergeev
Subscribers: hiraditya, zzheng, dmgreen, llvm-commits
Differential Revision: https://reviews.llvm.org/D67701