Move platform abstraction to base library

test/cctest/test-macro-assembler-mips.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 49 matching lines @@
 
 TEST(CopyBytes) {
   CcTest::InitializeVM();
   Isolate* isolate = Isolate::Current();
   HandleScope handles(isolate);
 
   const int data_size = 1 * KB;
   size_t act_size;
 
   // Allocate two blocks to copy data between.
-  byte* src_buffer = static_cast<byte*>(OS::Allocate(data_size, &act_size, 0));
+  byte* src_buffer =
+      static_cast<byte*>(v8::base::OS::Allocate(data_size, &act_size, 0));
   CHECK(src_buffer);
   CHECK(act_size >= static_cast<size_t>(data_size));
-  byte* dest_buffer = static_cast<byte*>(OS::Allocate(data_size, &act_size, 0));
+  byte* dest_buffer =
+      static_cast<byte*>(v8::base::OS::Allocate(data_size, &act_size, 0));
   CHECK(dest_buffer);
   CHECK(act_size >= static_cast<size_t>(data_size));
 
   // Storage for a0 and a1.
   byte* a0_;
   byte* a1_;
 
   MacroAssembler assembler(isolate, NULL, 0);
   MacroAssembler* masm = &assembler;
 
@@ skipping 83 matching lines @@
   TestNaN(
           "var result;"
           "for (var i = 0; i < 2; i++) {"
           "  result = [NaN];"
           "}"
           "result;");
 }
 
 
 #undef __