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[AArch64] Fix bug in large stack spill slot handling (PR27717)
Summary: Fix bug in MachO path where a frame index offset would not be reserved for handling large frames when an extra non-used callee-save register was saved. In the case where the extra register is reserved or not a GPR (e.g. %FP in the MachO case), this would lead to the register scavenger later failing when called from PrologEpilogInserter. Reviewers: t.p.northover Subscribers: aemerson, rengolin, mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D20185 llvm-svn: 269697
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