[dev.ssa] cmd/compile/internal/ssa: Use Ninit from expressions

If an expression has an Ninit list, generate code for it.
Required for (at least) OANDAND.

Change-Id: I94c9e22e2a76955736f4a8e574d92711419c5e5c
Reviewed-on: https://go-review.googlesource.com/12072Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/compile/internal/gc/ssa.go

@@ -393,7 +393,6 @@ func (s *state) stmt(n *Node) {
 		s.startBlock(bCond)
 		var cond *ssa.Value
 		if n.Left != nil {
-			s.stmtList(n.Left.Ninit)
 			cond = s.expr(n.Left)
 		} else {
 			cond = s.entryNewValue0A(ssa.OpConst, Types[TBOOL], true)
@@ -453,6 +452,7 @@ func (s *state) expr(n *Node) *ssa.Value {
 	s.pushLine(n.Lineno)
 	defer s.popLine()
 
+	s.stmtList(n.Ninit)
 	switch n.Op {
 	case ONAME:
 		if n.Class == PFUNC {