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Currently, musttail codegen is relying on sibcall optimization, and reporting a fatal error if fails. Sibcall optimization fails when stack arguments need to be modified, which is insufficient for musttail. The logic for moving arguments in memory safely is already implemented for GuaranteedTailCallOpt. This change merely arranges for musttail calls to use it. No functional change for GuaranteedTailCallOpt. Reviewers: espindola Differential Revision: http://reviews.llvm.org/D3493 llvm-svn: 207598
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