[dev.ssa] cmd/compile/internal/ssa: Use explicit size for store ops

[dev.ssa] cmd/compile/internal/ssa: Use explicit size for store ops

Using the type of the store argument is not safe, it may change
during rewriting, giving us the wrong store width.

(Store ptr (Trunc32to16 val) mem)

This should be a 2-byte store.  But we have the rule:

(Trunc32to16 x) -> x

So if the Trunc rewrite happens before the Store -> MOVW rewrite,
then the Store thinks that the value it is storing is 4 bytes
in size and uses a MOVL.  Bad things ensue.

Fix this by encoding the store width explicitly in the auxint field.

In general, we can't rely on the type of arguments, as they may
change during rewrites.  The type of the op itself (as used by
the Load rules) is still ok to use.

Change-Id: I9e2359e4f657bb0ea0e40038969628bf0f84e584
Reviewed-on: https://go-review.googlesource.com/13636
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>