cmd/compile: reduce slice header allocation when parsing := assignments

The colas function allocates 2 slice headers in each call (via Nodes.Set)
only to throw away those slice headers in the common case where both the
lhs and rhs in "lhs := rhs" have length 1.

Avoid the Nodes.Set calls in those cases. For make.bash, this eliminates
~63,000 slice header allocations.

Also: Minor cleanups in colasdefn.

Change-Id: Ib114a67c3adeb8821868bd71a5e0f5e2e19fcd4f
Reviewed-on: https://go-review.googlesource.com/21170
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -636,7 +636,7 @@ func (p *parser) simple_stmt(labelOk, rangeOk bool) *Node {
 			r := Nod(ORANGE, nil, p.expr())
 			r.List.Set(lhs)
 			r.Colas = true
-			colasdefn(r.List, r)
+			colasdefn(lhs, r)
 			return r
 		}