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Support for dynamic stack alignments in the PPC backend has been unfinished, in part because it depends on dynamic stack realignment (which I only just recently implemented fully). Now we can also support dynamic allocas with higher than the default target stack alignment (16 bytes). In order to round-up the requested size to the maximum requested alignment, we need an additional register to hold the rounded-up size. We're already using one scavenged register to hold the previous stack-pointer value (which needs to be stored with the signal-safe stdux update), and so when we have dynamic allocas and a large alignment, we allocate two emergency spill slots for the scavenger. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186562 91177308-0d34-0410-b5e6-96231b3b80d8
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