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X86: Emit an ABI compliant prologue and epilogue for Win64
Win64 has specific contraints on what valid prologues and epilogues look like. This constraint is born from the flexibility and descriptiveness of Win64's unwind opcodes. Prologues previously emitted by LLVM could not be represented by the unwind opcodes, preventing operations powered by stack unwinding to successfully work. Differential Revision: http://reviews.llvm.org/D7520 llvm-svn: 228641
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