cmd/compile: combine stores into larger widths
Combine stores into larger widths when it is safe to do so. Add clobber() function so stray dead uses do not impede the above rewrites. Fix bug in loads where all intermediate values depending on a small load (not just the load itself) must have no other uses. We really need the small load to be dead after the rewrite.. Fixes #14267 Change-Id: Ib25666cb19777f65082c76238fba51a76beb5d74 Reviewed-on: https://go-review.googlesource.com/22326 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by:Todd Neal <todd@tneal.org>
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