[dev.ssa] cmd/compile: allow rewrite rules to specify a target block

[dev.ssa] cmd/compile: allow rewrite rules to specify a target block

Some rewrite rules need to make sure the rewrite target ends up
in a specific block.  For example:

(MOVBQSX (MOVBload [off] {sym} ptr mem)) ->
   @v.Args[0].Block (MOVBQSXload <v.Type> [off] {sym} ptr mem)

The MOVBQSXload op needs to be in the same block as the MOVBload
(to ensure exactly one memory is live at basic block boundaries).

Change-Id: Ibe49a4183ca91f6c859cba8135927f01d176e064
Reviewed-on: https://go-review.googlesource.com/15804
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>