cmd/asm: remove nonexistent amd64 instructions

These have no accepted input syntax and,
as far as I can tell, do not actually exist.

Change-Id: Iafdfb71adccad76230191d922eb7ddf78b7d5898
Reviewed-on: https://go-review.googlesource.com/19612Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/internal/obj/x86/a.out.go

@@ -289,8 +289,6 @@ const (
 	AFMOVX
 	AFMOVXP
 
-	AFCOMB
-	AFCOMBP
 	AFCOMD
 	AFCOMDP
 	AFCOMDPP
@@ -620,14 +618,7 @@ const (
 	APADDUSW
 	APADDW
 	APAND
-	APANDB
-	APANDL
 	APANDN
-	APANDSB
-	APANDSW
-	APANDUSB
-	APANDUSW
-	APANDW
 	APAVGB
 	APAVGW
 	APCMPEQB

src/cmd/internal/obj/x86/anames.go

@@ -255,8 +255,6 @@ var Anames = []string{
 	"FMOVWP",
 	"FMOVX",
 	"FMOVXP",
-	"FCOMB",
-	"FCOMBP",
 	"FCOMD",
 	"FCOMDP",
 	"FCOMDPP",
@@ -569,14 +567,7 @@ var Anames = []string{
 	"PADDUSW",
 	"PADDW",
 	"PAND",
-	"PANDB",
-	"PANDL",
 	"PANDN",
-	"PANDSB",
-	"PANDSW",
-	"PANDUSB",
-	"PANDUSW",
-	"PANDW",
 	"PAVGB",
 	"PAVGW",
 	"PCMPEQB",

src/cmd/internal/obj/x86/asm6.go

@@ -1525,8 +1525,6 @@ var optab =
 	{AFCMOVNE, yfcmv, Px, [23]uint8{0xdb, 01}},
 	{AFCMOVNU, yfcmv, Px, [23]uint8{0xdb, 03}},
 	{AFCMOVUN, yfcmv, Px, [23]uint8{0xda, 03}},
-	{AFCOMB, nil, 0, [23]uint8{}},
-	{AFCOMBP, nil, 0, [23]uint8{}},
 	{AFCOMD, yfadd, Px, [23]uint8{0xdc, 02, 0xd8, 02, 0xdc, 02}},  /* botch */
 	{AFCOMDP, yfadd, Px, [23]uint8{0xdc, 03, 0xd8, 03, 0xdc, 03}}, /* botch */
 	{AFCOMDPP, ycompp, Px, [23]uint8{0xde, 03}},