Move platform abstraction to base library

src/x64/code-stubs-x64.h

 // Copyright 2011 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.
 
 #ifndef V8_X64_CODE_STUBS_X64_H_
 #define V8_X64_CODE_STUBS_X64_H_
 
 #include "src/ic-inl.h"
 
 namespace v8 {
@@ skipping 230 matching lines @@
         ASSERT(GetMode(stub) == STORE_BUFFER_ONLY);
         stub->instruction_start()[0] = kTwoByteJumpInstruction;
         break;
       case INCREMENTAL_COMPACTION:
         ASSERT(GetMode(stub) == STORE_BUFFER_ONLY);
         stub->instruction_start()[0] = kTwoByteNopInstruction;
         stub->instruction_start()[2] = kFiveByteJumpInstruction;
         break;
     }
     ASSERT(GetMode(stub) == mode);
-    CPU::FlushICache(stub->instruction_start(), 7);
+    CpuFeatures::FlushICache(stub->instruction_start(), 7);
   }
 
  private:
   // This is a helper class for freeing up 3 scratch registers, where the third
   // is always rcx (needed for shift operations).  The input is two registers
   // that must be preserved and one scratch register provided by the caller.
   class RegisterAllocation {
    public:
     RegisterAllocation(Register object,
                        Register address,
@@ skipping 151 matching lines @@
   RememberedSetAction remembered_set_action_;
   SaveFPRegsMode save_fp_regs_mode_;
   Label slow_;
   RegisterAllocation regs_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODE_STUBS_X64_H_