internal/cpu: fix cpu cacheLineSize for arm64 darwin(a.k.a. M1)

The existing value for M1 is 64, which is the same as other arm64 cpus.
But the correct cacheLineSize for M1 should be 128, which can be
verified using the following command:

$ sysctl -a hw | grep cachelinesize
hw.cachelinesize: 128

Fixes golang#53075

src/internal/cpu/cpu_arm64.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build arm64 && !darwin
+
 package cpu
 
 const CacheLinePadSize = 64

src/internal/cpu/cpu_arm64_darwin.go

@@ -6,6 +6,29 @@
 
 package cpu
 
+const CacheLinePadSize = 128
+
+func doinit() {
+	options = []option{
+		{Name: "aes", Feature: &ARM64.HasAES},
+		{Name: "pmull", Feature: &ARM64.HasPMULL},
+		{Name: "sha1", Feature: &ARM64.HasSHA1},
+		{Name: "sha2", Feature: &ARM64.HasSHA2},
+		{Name: "crc32", Feature: &ARM64.HasCRC32},
+		{Name: "atomics", Feature: &ARM64.HasATOMICS},
+		{Name: "cpuid", Feature: &ARM64.HasCPUID},
+		{Name: "isNeoverseN1", Feature: &ARM64.IsNeoverseN1},
+		{Name: "isZeus", Feature: &ARM64.IsZeus},
+	}
+
+	// arm64 uses different ways to detect CPU features at runtime depending on the operating system.
+	osInit()
+}
+
+func getisar0() uint64
+
+func getMIDR() uint64
+
 func osInit() {
 	ARM64.HasATOMICS = sysctlEnabled([]byte("hw.optional.armv8_1_atomics\x00"))
 	ARM64.HasCRC32 = sysctlEnabled([]byte("hw.optional.armv8_crc32\x00"))