cmd/6g, etc: cleanup, moving code out of near-empty gg.go files

Clear out gg.go files, and move things into consistent places between
the cmd/?g directories.

Change-Id: I81e04180613b806e0bfbb88519e66111ce9f74a3
Reviewed-on: https://go-review.googlesource.com/9080Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/6g/gg.go

-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import "cmd/internal/obj/x86"
-import "cmd/internal/gc"
-
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-var reg [x86.MAXREG]uint8
-
-var panicdiv *gc.Node
-
-/*
- * cgen.c
- */
-
-/*
- * list.c
- */

src/cmd/6g/ggen.go

@@ -166,6 +166,8 @@ func appendpp(p *obj.Prog, as int, ftype int, freg int, foffset int64, ttype int
 	return q
 }
 
+var panicdiv *gc.Node
+
 /*
  * generate division.
  * generates one of:

src/cmd/6g/reg.go

@@ -40,6 +40,8 @@ const (
 	NREGVAR = 32
 )
 
+var reg [x86.MAXREG]uint8
+
 var regname = []string{
 	".AX",
 	".CX",

src/cmd/7g/gg.go

-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import "cmd/internal/obj/arm64"
-import "cmd/internal/gc"
-
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-var reg [arm64.NREG + arm64.NFREG]uint8
-
-var panicdiv *gc.Node
-
-/*
- * cgen.c
- */
-
-/*
- * list.c
- */
-
-/*
- * reg.c
- */

src/cmd/7g/ggen.go

@@ -124,6 +124,8 @@ func ginsnop() {
 	gins(arm64.AHINT, &con, nil)
 }
 
+var panicdiv *gc.Node
+
 /*
  * generate division.
  * generates one of:

src/cmd/7g/reg.go

@@ -39,6 +39,8 @@ const (
 	NREGVAR = 64 /* 32 general + 32 floating */
 )
 
+var reg [arm64.NREG + arm64.NFREG]uint8
+
 var regname = []string{
 	".R0",
 	".R1",

src/cmd/8g/gg.go

-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import "cmd/internal/obj/x86"
-import "cmd/internal/gc"
-
-// TODO(rsc):
-//	assume CLD?
-
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// foptoas flags
-const (
-	Frev  = 1 << 0
-	Fpop  = 1 << 1
-	Fpop2 = 1 << 2
-)
-
-var reg [x86.MAXREG]uint8
-
-var panicdiv *gc.Node
-
-/*
- * cgen.c
- */
-
-/*
- * list.c
- */

src/cmd/8g/ggen.go

@@ -189,6 +189,8 @@ func clearfat(nl *gc.Node) {
 	}
 }
 
+var panicdiv *gc.Node
+
 /*
  * generate division.
  * caller must set:

src/cmd/8g/gsubr.go

@@ -42,6 +42,13 @@ import (
 // At the same time, can raise StackBig in ../../runtime/stack.h.
 var unmappedzero uint32 = 4096
 
+// foptoas flags
+const (
+	Frev  = 1 << 0
+	Fpop  = 1 << 1
+	Fpop2 = 1 << 2
+)
+
 /*
  * return Axxx for Oxxx on type t.
  */

src/cmd/8g/reg.go

@@ -37,6 +37,8 @@ const (
 	NREGVAR = 16 /* 8 integer + 8 floating */
 )
 
+var reg [x86.MAXREG]uint8
+
 var regname = []string{
 	".ax",
 	".cx",