cmd/compile: don't alloc Name/Param for unresolved syms

ONONAME nodes generated from unresolved symbols don't need Params.
They only need Names to store Iota; move Iota to Node.Xoffset.
While we're here, change iota to int64 to reduce casting.

Passes toolstash -cmp.

name       old alloc/op     new alloc/op     delta
Template       39.9MB ± 0%      39.7MB ± 0%  -0.39%        (p=0.000 n=19+20)
Unicode        30.9MB ± 0%      30.7MB ± 0%  -0.35%        (p=0.000 n=20+20)
GoTypes         119MB ± 0%       118MB ± 0%  -0.42%        (p=0.000 n=20+20)
Compiler        464MB ± 0%       461MB ± 0%  -0.54%        (p=0.000 n=19+20)

name       old allocs/op    new allocs/op    delta
Template         386k ± 0%        383k ± 0%  -0.62%        (p=0.000 n=20+20)
Unicode          323k ± 0%        321k ± 0%  -0.49%        (p=0.000 n=20+20)
GoTypes         1.16M ± 0%       1.15M ± 0%  -0.67%        (p=0.000 n=20+20)
Compiler        4.09M ± 0%       4.05M ± 0%  -0.95%        (p=0.000 n=20+20)

Change-Id: Ib27219a0d0405def1b4dadacf64935ba12d10a94
Reviewed-on: https://go-review.googlesource.com/32237
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

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

@@ -504,9 +504,7 @@ func treecopy(n *Node, lineno int32) *Node {
 			if lineno != 0 {
 				m.Lineno = lineno
 			}
-			m.Name = new(Name)
-			*m.Name = *n.Name
-			m.Name.Iota = iota_
+			m.SetIota(iota_)
 			return &m
 		}
 		return n