cmd/dist: build cmd/compile/internal/syntax

Change-Id: Ie6dd2318e031be445c0b1ae65d4c78723d5a1167
Reviewed-on: https://go-review.googlesource.com/27197
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

src/cmd/dist/buildtool.go

@@ -36,9 +36,10 @@ var bootstrapDirs = []string{
 	"compile/internal/gc",
 	"compile/internal/mips64",
 	"compile/internal/ppc64",
+	"compile/internal/s390x",
 	"compile/internal/ssa",
+	"compile/internal/syntax",
 	"compile/internal/x86",
-	"compile/internal/s390x",
 	"internal/bio",
 	"internal/gcprog",
 	"internal/dwarf",