8241587: Aarch64: remove x86 specifics from os_linux.cpp/hpp/inline.hpp

Reviewed-by: dholmes

src/hotspot/os_cpu/linux_aarch64/os_linux_aarch64.cpp

@@ -462,12 +462,6 @@ int os::Linux::get_fpu_control_word(void) {
 void os::Linux::set_fpu_control_word(int fpu_control) {
 }
 
-// Check that the linux kernel version is 2.4 or higher since earlier
-// versions do not support SSE without patches.
-bool os::supports_sse() {
-  return true;
-}
-
 bool os::is_allocatable(size_t bytes) {
   return true;
 }

src/hotspot/os_cpu/linux_aarch64/os_linux_aarch64.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, Red Hat Inc. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -27,9 +27,6 @@
 #define OS_CPU_LINUX_AARCH64_OS_LINUX_AARCH64_HPP
 
   static void setup_fpu();
-  static bool supports_sse();
-
-  static jlong rdtsc();
 
   static bool is_allocatable(size_t bytes);