cmd/compile: eliminate copy for static literals
*p = [5]byte{1,2,3,4,5} First we allocate a global containing the RHS. Then we copy that global to a local stack variable, and then copy that local stack variable to *p. The intermediate copy is unnecessary. Note that this only works if the RHS is completely constant. If the code was: *p = [5]byte{1,2,x,4,5} this optimization doesn't apply as we have to construct the RHS on the stack before copying it to *p. Fixes #12841 Change-Id: I7cd0404ecc7a2d1750cbd8fe1222dba0fa44611f Reviewed-on: https://go-review.googlesource.com/22192Reviewed-by:Josh Bleecher Snyder <josharian@gmail.com>
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