style: put the repository assembly in gasm fmt canonical form

Assisted-by: GLM 5.3 Flash

testdata/verify/basic_arm64.s

@@ -5,53 +5,56 @@
 
 // add returns a + b.
 TEXT ·add(SB), NOSPLIT, $0-24
-	MOVD	a+0(FP), R4
-	MOVD	b+8(FP), R5
-	ADD	R5, R4, R4
-	MOVD	R4, ret+16(FP)
+	MOVD a+0(FP), R4
+	MOVD b+8(FP), R5
+	ADD  R5, R4, R4
+	MOVD R4, ret+16(FP)
 	RET
 
 // arith exercises the register-register integer set.
 TEXT ·arith(SB), NOSPLIT, $0-0
-	ADD	R4, R5, R6
-	SUB	R7, R8, R9
-	AND	R10, R11, R12
-	ORR	R12, R13, R14
-	EOR	R14, R15, R16
-	CMP	R16, R17
-	ADD	R4, R5
-	SUB	R6, R7
+	ADD R4, R5, R6
+	SUB R7, R8, R9
+	AND R10, R11, R12
+	ORR R12, R13, R14
+	EOR R14, R15, R16
+	CMP R16, R17
+	ADD R4, R5
+	SUB R6, R7
 	RET
 
 // branch exercises conditional and unconditional control flow.
 TEXT ·branch(SB), NOSPLIT, $0-0
-	BEQ	done
-	BNE	skip
-	BGE	done
-	BLT	done
-	BGT	done
-	BLE	done
+	BEQ done
+	BNE skip
+	BGE done
+	BLT done
+	BGT done
+	BLE done
+
 skip:
-	B	loop
+	B   loop
+
 loop:
-	ADD	R4, R5
+	ADD R4, R5
 	RET
+
 done:
 	RET
 
 // mov exercises the MOV pseudo-instruction.
 TEXT ·mov(SB), NOSPLIT, $0-16
-	MOVD	$0, R4
-	MOVD	$1, R5
-	MOVD	$42, R6
-	MOVD	a+0(FP), R7
-	MOVD	R7, ret+0(FP)
-	MOVW	$100, R8
+	MOVD $0, R4
+	MOVD $1, R5
+	MOVD $42, R6
+	MOVD a+0(FP), R7
+	MOVD R7, ret+0(FP)
+	MOVW $100, R8
 	RET
 
 // frame exercises the prologue/epilogue of a function with a real frame.
 TEXT ·frame(SB), NOSPLIT, $32-8
-	MOVD	arg+0(FP), R4
-	ADD	$1, R4, R4
-	MOVD	R4, ret+0(FP)
+	MOVD arg+0(FP), R4
+	ADD  $1, R4, R4
+	MOVD R4, ret+0(FP)
 	RET