cmd/internal/obj/arm64: reorder the assembler's optab entries

Current optab entries are unordered, because the new instructions
are added at the end of the optab. The patch reorders them by comments
in optab, such as arithmetic operations, logical operations and a
series of load/store etc.

The patch removes the VMOVS opcode because FMOVS already has the same
operation.

Change-Id: Iccdf89ecbb3875b9dfcb6e06be2cc19c7e5581a2
Reviewed-on: https://go-review.googlesource.com/109896
Run-TryBot: Cherry Zhang <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Cherry Zhang <[email protected]>

Author: zhangfannie

src/cmd/asm/internal/asm/testdata/arm64.s

@@ -226,12 +226,15 @@ TEXT	foo(SB), DUPOK|NOSPLIT, $-8
 	VST1.P	V4.D[1], 8(R0)                                  // 04849f4d
 	VST1.P	V4.D[1], (R0)(R1)                               // VST1.P	V4.D[1], (R0)(R1*1) // 0484814d
 	VST1	V4.D[1], (R0)                                   // 0484004d
-	VMOVS	V20, (R0)                                       // 140000bd
-	VMOVS.P	V20, 4(R0)                                      // 144400bc
-	VMOVS.W	V20, 4(R0)                                      // 144c00bc
-	VMOVS	(R0), V20                                       // 140040bd
-	VMOVS.P	8(R0), V20                                      // 148440bc
-	VMOVS.W	8(R0), V20                                      // 148c40bc
+	FMOVS	F20, (R0)                                       // 140000bd
+	FMOVS.P	F20, 4(R0)                                      // 144400bc
+	FMOVS.W	F20, 4(R0)                                      // 144c00bc
+	FMOVS	(R0), F20                                       // 140040bd
+	FMOVS.P	8(R0), F20                                      // 148440bc
+	FMOVS.W	8(R0), F20                                      // 148c40bc
+	FMOVD	F20, (R2)                                       // 540000fd
+	FMOVD.P	F20, 8(R1)                                      // 348400fc
+	FMOVD.W	8(R1), F20                                      // 348c40fc
 	PRFM	(R2), PLDL1KEEP                                 // 400080f9
 	PRFM	16(R2), PLDL1KEEP                               // 400880f9
 	PRFM	48(R6), PSTL2STRM                               // d31880f9

src/cmd/internal/obj/arm64/a.out.go

@@ -884,7 +884,6 @@ const (
 	AVREV64
 	AVST1
 	AVDUP
-	AVMOVS
 	AVADDV
 	AVMOVI
 	AVUADDLV

src/cmd/internal/obj/arm64/anames.go

@@ -386,7 +386,6 @@ var Anames = []string{
 	"VREV64",
 	"VST1",
 	"VDUP",
-	"VMOVS",
 	"VADDV",
 	"VMOVI",
 	"VUADDLV",