cmd/8a, cmd/8l: add BSWAPL

R=ken2
CC=golang-dev
https://golang.org/cl/6208093

src/cmd/8a/lex.c

@@ -271,6 +271,7 @@ struct
 	"BSFW",		LTYPE3,	ABSFW,
 	"BSRL",		LTYPE3,	ABSRL,
 	"BSRW",		LTYPE3,	ABSRW,
+	"BSWAPL",	LTYPE1,	ABSWAPL,
 	"BTCL",		LTYPE3,	ABTCL,
 	"BTCW",		LTYPE3,	ABTCW,
 	"BTL",		LTYPE3,	ABTL,

src/cmd/8l/8.out.h

@@ -456,6 +456,8 @@ enum	as
 	APREFETCHT1,
 	APREFETCHT2,
 	APREFETCHNTA,
+	
+	ABSWAPL,
 
 	ALAST
 };

src/cmd/8l/optab.c

@@ -242,6 +242,11 @@ uchar	ypopl[] =
 	Ynone,	Ym,	Zo_m,	2,
 	0
 };
+uchar	ybswap[] =
+{
+	Ynone,	Yrl,	Z_rp,	1,
+	0,
+};
 uchar	yscond[] =
 {
 	Ynone,	Ymb,	Zo_m,	2,
@@ -771,5 +776,7 @@ Optab optab[] =
 	{ APREFETCHT2,	yprefetch,	Pm,	0x18,(03) },
 	{ APREFETCHNTA,	yprefetch,	Pm,	0x18,(00) },
 
+	{ ABSWAPL,	ybswap,	Pm,	0xc8 },
+
 	0
 };