Move platform abstraction to base library

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1880 matching lines @@
   Str(scratch2, FieldMemOperand(string, String::kHashFieldOffset));
 }
 
 
 int MacroAssembler::ActivationFrameAlignment() {
 #if V8_HOST_ARCH_ARM64
   // Running on the real platform. Use the alignment as mandated by the local
   // environment.
   // Note: This will break if we ever start generating snapshots on one ARM
   // platform for another ARM platform with a different alignment.
-  return OS::ActivationFrameAlignment();
+  return base::OS::ActivationFrameAlignment();
 #else  // V8_HOST_ARCH_ARM64
   // If we are using the simulator then we should always align to the expected
   // alignment. As the simulator is used to generate snapshots we do not know
   // if the target platform will need alignment, so this is controlled from a
   // flag.
   return FLAG_sim_stack_alignment;
 #endif  // V8_HOST_ARCH_ARM64
 }
 
 
@@ skipping 3382 matching lines @@
   }
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64