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Use the 3-byte (4 with REX prefix) push-pop sequence for materializing small constants. This is smaller than using a mov (5, 6 or 7 bytes depending on size and REX prefix), but it's likely to be slower, so only used for 'minsize'. This is a follow-up to r255656. Differential Revision: http://reviews.llvm.org/D15549 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255936 91177308-0d34-0410-b5e6-96231b3b80d8
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