runtime: fix 386 build

mark finalizer1 as having no pointers

TBR=iant
CC=golang-codereviews
https://golang.org/cl/141570045

src/runtime/mgc0.c

@@ -738,6 +738,7 @@ runtime·gcphasework(G *gp)
 	gp->gcworkdone = true;
 }
 
+#pragma dataflag NOPTR
 static byte finalizer1[] = {
 	// Each Finalizer is 5 words, ptr ptr uintptr ptr ptr.
 	// Each byte describes 4 words.