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Select gprb or fprb when def/use register operand of G_PHI is used/defined by either: copy to/from physical register or instruction with only one mapping available for that use/def operand. Integer s64 phi is handled with narrowScalar when mapping is applied, produced artifacts are combined away. Manually set gprb to all register operands of instructions created during narrowScalar. Differential Revision: https://reviews.llvm.org/D64351 llvm-svn: 365494
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