cmd/internal/obj/riscv: fix LMUL encoding for MF2 and MF8

The encodings for the riscv64 special operands SPOP_MF2 and SPOP_MF8
are incorrect, i.e., their values are swapped.  This leads to
incorrect encodings for the VSETVLI and VSETIVLI instructions.  The
assembler currently encodes

VSETVLI	X10, E32, MF8, TA, MA, X12

as

VSETVLI	X10, E32, MF2, TA, MA, X12

We update the encodings for SPOP_MF2 and SPOP_MF8 so that they match
the LMUL table in section "31.3.4. Vector type register, vtype" of
the "RISC-V Instruction Set Manual Volume 1".

Change-Id: Ic73355533d7c2a901ee060b35c2f7af6d58453e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/670016
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Joel Sing <joel@sing.id.au>

Author: markdryan

src/cmd/asm/internal/asm/testdata/riscv64.s

@@ -438,9 +438,9 @@ start:
 	VSETVLI	X10, E32, M2, TA, MA, X12		// 5776150d
 	VSETVLI	X10, E32, M4, TA, MA, X12		// 5776250d
 	VSETVLI	X10, E32, M8, TA, MA, X12		// 5776350d
-	VSETVLI	X10, E32, MF2, TA, MA, X12		// 5776550d
+	VSETVLI	X10, E32, MF8, TA, MA, X12		// 5776550d
 	VSETVLI	X10, E32, MF4, TA, MA, X12		// 5776650d
-	VSETVLI	X10, E32, MF8, TA, MA, X12		// 5776750d
+	VSETVLI	X10, E32, MF2, TA, MA, X12		// 5776750d
 	VSETVLI	X10, E32, M1, TA, MA, X12		// 5776050d
 	VSETVLI	$15, E32, M1, TA, MA, X12		// 57f607cd
 	VSETIVLI $0, E32, M1, TA, MA, X12		// 577600cd

src/cmd/internal/obj/riscv/cpu.go

@@ -1297,9 +1297,9 @@ var specialOperands = map[SpecialOperand]struct {
 	SPOP_M2:  {encoding: 1, name: "M2"},
 	SPOP_M4:  {encoding: 2, name: "M4"},
 	SPOP_M8:  {encoding: 3, name: "M8"},
-	SPOP_MF2: {encoding: 5, name: "MF2"},
+	SPOP_MF8: {encoding: 5, name: "MF8"},
 	SPOP_MF4: {encoding: 6, name: "MF4"},
-	SPOP_MF8: {encoding: 7, name: "MF8"},
+	SPOP_MF2: {encoding: 7, name: "MF2"},
 
 	SPOP_E8:  {encoding: 0, name: "E8"},
 	SPOP_E16: {encoding: 1, name: "E16"},