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hasReservedSpillSlot returns a dummy frame index of '0' on PPC64 for the non-volatile condition registers, which leads to the CalleSavedInfo either referencing an unrelated stack object, or an invalid object if there are no stack objects. The latter case causes the mir-printer to crash due to assertions that checks if the frame index referenced by a CalleeSavedInfo is valid. To fix the problem create an immutable FixedStack object at the correct offset in the linkage area of the previous stack frame (ie SP + positive offset). Differential Revision: https://reviews.llvm.org/D73709
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