Andrew Wei 4ca753f4e3 [RISCV] Implement mayBeEmittedAsTailCall for tail call optimization ...

Implement TargetLowering callback mayBeEmittedAsTailCall for riscv in CodeGenPrepare,
which will duplicate return instructions to enable tailcall optimization.

Differential Revision: https://reviews.llvm.org/D73699

2020-02-18 23:56:42 +08:00

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