[AArch64] Simplify aarch64_can_eliminate
Simplify aarch64_can_eliminate - if we need a frame pointer, we must eliminate to HARD_FRAME_POINTER_REGNUM. Rather than hardcoding all combinations from the ELIMINABLE_REGS list, just do the correct check. gcc/ * config/aarch64/aarch64.c (aarch64_can_eliminate): Simplify logic. From-SVN: r254534
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