feat(loong64): encode the full LSX and LASX table

Assisted-by: GLM 5.3 Flash

testdata/verify/vector_mul_loong64.s

@@ -0,0 +1,108 @@
+// Differential kernel: the mul vector slice against the Go
+// toolchain's loong64enc1.s rows (gasm v. go tool asm, byte for byte).
+
+#include "textflag.h"
+
+TEXT ·VMULB(SB), NOSPLIT, $0
+	VMULB V1, V2, V3
+	RET
+
+TEXT ·VMULH(SB), NOSPLIT, $0
+	VMULH V1, V2, V3
+	RET
+
+TEXT ·VMULV(SB), NOSPLIT, $0
+	VMULV V1, V2, V3
+	RET
+
+TEXT ·VMUHB(SB), NOSPLIT, $0
+	VMUHB V1, V2, V3
+	RET
+
+TEXT ·VMUHH(SB), NOSPLIT, $0
+	VMUHH V1, V2, V3
+	RET
+
+TEXT ·VMUHW(SB), NOSPLIT, $0
+	VMUHW V1, V2, V3
+	RET
+
+TEXT ·VMUHV(SB), NOSPLIT, $0
+	VMUHV V1, V2, V3
+	RET
+
+TEXT ·VMUHBU(SB), NOSPLIT, $0
+	VMUHBU V1, V2, V3
+	RET
+
+TEXT ·VMUHHU(SB), NOSPLIT, $0
+	VMUHHU V1, V2, V3
+	RET
+
+TEXT ·VMUHWU(SB), NOSPLIT, $0
+	VMUHWU V1, V2, V3
+	RET
+
+TEXT ·VMUHVU(SB), NOSPLIT, $0
+	VMUHVU V1, V2, V3
+	RET
+
+TEXT ·XVMULB(SB), NOSPLIT, $0
+	XVMULB X3, X2, X1
+	RET
+
+TEXT ·XVMULH(SB), NOSPLIT, $0
+	XVMULH X3, X2, X1
+	RET
+
+TEXT ·XVMULV(SB), NOSPLIT, $0
+	XVMULV X3, X2, X1
+	RET
+
+TEXT ·XVMUHB(SB), NOSPLIT, $0
+	XVMUHB X3, X2, X1
+	RET
+
+TEXT ·XVMUHH(SB), NOSPLIT, $0
+	XVMUHH X3, X2, X1
+	RET
+
+TEXT ·XVMUHW(SB), NOSPLIT, $0
+	XVMUHW X3, X2, X1
+	RET
+
+TEXT ·XVMUHV(SB), NOSPLIT, $0
+	XVMUHV X3, X2, X1
+	RET
+
+TEXT ·XVMUHBU(SB), NOSPLIT, $0
+	XVMUHBU X3, X2, X1
+	RET
+
+TEXT ·XVMUHHU(SB), NOSPLIT, $0
+	XVMUHHU X3, X2, X1
+	RET
+
+TEXT ·XVMUHWU(SB), NOSPLIT, $0
+	XVMUHWU X3, X2, X1
+	RET
+
+TEXT ·XVMUHVU(SB), NOSPLIT, $0
+	XVMUHVU X3, X2, X1
+	RET
+
+TEXT ·VMULF(SB), NOSPLIT, $0
+	VMULF V1, V2, V3
+	RET
+
+TEXT ·VMULD(SB), NOSPLIT, $0
+	VMULD V1, V2, V3
+	RET
+
+TEXT ·XVMULF(SB), NOSPLIT, $0
+	XVMULF X1, X2, X3
+	RET
+
+TEXT ·XVMULD(SB), NOSPLIT, $0
+	XVMULD X1, X2, X3
+	RET