ARM64: Fix native builds

src/cpu.cc

Index: src/cpu.cc
diff --git a/src/cpu.cc b/src/cpu.cc
index 3baae64f6d74b98d0917ae4e1829b4eb64a2c5cb..8d9afd84ae444c1288d7ad3205ea51293932638a 100644
--- a/src/cpu.cc
+++ b/src/cpu.cc
@@ -206,6 +206,7 @@ class CPUInfo V8_FINAL BASE_EMBEDDED {
   size_t datalen_;
 };
 
+#if V8_HOST_ARCH_ARM || V8_HOST_ARCH_MIPS
 
 // Checks that a space-separated list of items contains one given 'item'.
 static bool HasListItem(const char* list, const char* item) {
@@ -231,6 +232,8 @@ static bool HasListItem(const char* list, const char* item) {
   return false;
 }
 
+#endif  // V8_HOST_ARCH_ARM || V8_HOST_ARCH_MIPS
+
 #endif  // V8_OS_LINUX
 
 #endif  // V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64