cmd/compile: regalloc enforces 2-address instructions
Instead of being a hint, resultInArg0 is now enforced by regalloc. This allows us to delete all the code from amd64/ssa.go which deals with converting from a semantically three-address instruction into some copies plus a two-address instruction. Change-Id: Id4f39a80be4b678718bfd42a229f9094ab6ecd7c Reviewed-on: https://go-review.googlesource.com/21816Reviewed-by:Josh Bleecher Snyder <josharian@gmail.com>
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