allSGPRSpillsAreDead() should use actual FP/BP frame indices
The SGPR spills happen in SILowerSGPRSpills() and allSGPRSpillsAreDead() make sure there are no SGPR spills pending during PEI. But the FP/BP spills happen during PEI and are exceptions. Use actual frame indices of FP/BP in allSGPRSpillsAreDead() to accommodate the exceptions. Differential Revision: https://reviews.llvm.org/D86291
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