Merging r329761:

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r329761 | gberry | 2018-04-10 14:43:03 -0700 (Tue, 10 Apr 2018) | 13 lines

[AArch64][Falkor] Fix bug in Falkor HWPF collision avoidance pass.

Summary:
When inserting MOVs to avoid Falkor HWPF collisions, the non-base
register operand of load instructions (e.g. a register offset) was not
being considered live, so it could potentially have been used as a
scratch register, clobbering the actual offset value.

Reviewers: mcrosier

Subscribers: rengolin, javed.absar, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D45502
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llvm-svn: 330209