fix(git): add vendor in .gitignore

vendor/golang.org/x/sys/cpu/cpu_arm64.s

@@ -1,32 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build gc
-// +build gc
-
-#include "textflag.h"
-
-// func getisar0() uint64
-TEXT ·getisar0(SB),NOSPLIT,$0-8
-	// get Instruction Set Attributes 0 into x0
-	// mrs x0, ID_AA64ISAR0_EL1 = d5380600
-	WORD	$0xd5380600
-	MOVD	R0, ret+0(FP)
-	RET
-
-// func getisar1() uint64
-TEXT ·getisar1(SB),NOSPLIT,$0-8
-	// get Instruction Set Attributes 1 into x0
-	// mrs x0, ID_AA64ISAR1_EL1 = d5380620
-	WORD	$0xd5380620
-	MOVD	R0, ret+0(FP)
-	RET
-
-// func getpfr0() uint64
-TEXT ·getpfr0(SB),NOSPLIT,$0-8
-	// get Processor Feature Register 0 into x0
-	// mrs x0, ID_AA64PFR0_EL1 = d5380400
-	WORD	$0xd5380400
-	MOVD	R0, ret+0(FP)
-	RET