cmd/compile: fix problem with non-decomposed vars

Fix a bug introduced in patch 2 of
https://go-review.googlesource.com/72630 (sense of a map
lookup test was accidentally flipped).

Change-Id: Icc6096ee50be4605fa7542b9fd855c13b8aff090
Reviewed-on: https://go-review.googlesource.com/72850
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

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

@@ -484,7 +484,7 @@ func createComplexVars(fnsym *obj.LSym, debugInfo *ssa.FuncDebug, automDecls []*
 	// named X in this function, but no, I don't have enough
 	// information to reliably report its contents."
 	for _, n := range automDecls {
-		if _, found := ssaVars[n]; !found {
+		if _, found := ssaVars[n]; found {
 			continue
 		}
 		c := n.Sym.Name[0]