Broaden isSchedulingBoundary to check aliases of SP.
On PPC the stack pointer is X1, but ADJCALLSTACK writes R1. Fixes PR14315: Register regmask dependency problem with misched. llvm-svn: 168248
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On PPC the stack pointer is X1, but ADJCALLSTACK writes R1. Fixes PR14315: Register regmask dependency problem with misched. llvm-svn: 168248