cmd/compile: consider full number of struct components to deciding on inlining ==

Change-Id: I6bfbbce2ec5dfc7f9f99dbd82e51c2b0edacc87a
Reviewed-on: https://go-review.googlesource.com/59334
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

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

@@ -3298,7 +3298,7 @@ func walkcompare(n *Node, init *Nodes) *Node {
 		// We can compare several elements at once with 2/4/8 byte integer compares
 		inline = t.NumElem() <= 1 || (issimple[t.Elem().Etype] && (t.NumElem() <= 4 || t.Elem().Width*t.NumElem() <= maxcmpsize))
 	case TSTRUCT:
-		inline = t.NumFields() <= 4
+		inline = t.NumComponents() <= 4
 	}
 
 	cmpl := n.Left