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This commit adds tail call support to the MachineOutliner pass. This allows the outliner to insert jumps rather than calls in areas where tail calling is possible. Outlined tail calls include the return or terminator of the basic block being outlined from. Tail call support allows the outliner to take returns and terminators into consideration while finding candidates to outline. It also allows the outliner to save more instructions. For example, in the X86-64 outliner, a tail called outlined function saves one instruction since no return has to be inserted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297653 91177308-0d34-0410-b5e6-96231b3b80d8
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