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We currently try to push an even number of registers to preserve 8-byte alignment during a function's prologue, but only when the stack alignment is prcisely 8. Many of the reasons for doing it apply also when that alignment > 8 (the extra store is often free, and can save another stack adjustment, though less frequently for 16-byte stack alignment). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221321 91177308-0d34-0410-b5e6-96231b3b80d8