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[AMDGPU] Fix FP/BP spills when MUBUF constant offset exceeded

Authored by kerbowa on Aug 11 2020, 12:04 PM.

Description

[AMDGPU] Fix FP/BP spills when MUBUF constant offset exceeded

If we need a scratch register for the spill don't use the same scratch
register that is being used for the MBUF offset.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D85772

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