cmd/7g: remove loads that only load an immediate to be later used by ADD/SUB
Optimize the sequence: MOV $imm, Rt ADD Rt, Rs, Rd into: ADD $imm, Rs, Rd Saves 66k in godoc. Change-Id: I27b4aaa0ec80a59472fe2e5816efdf3db9c901ee Reviewed-on: https://go-review.googlesource.com/8632Reviewed-by: Minux Ma <minux@golang.org>
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