Introduce runtime/platform directory for code shared between vm

runtime/vm/assembler.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ASSEMBLER_H_
 #define VM_ASSEMBLER_H_
 
 #include "vm/allocation.h"
 #include "vm/assert.h"
 #include "vm/globals.h"
 #include "vm/growable_array.h"
 #include "vm/object.h"
 
 namespace dart {
 
 // Forward declarations.
 class Assembler;
 class AssemblerFixup;
 class AssemblerBuffer;
 class MemoryRegion;
 
 
 // External labels keep a function pointer to allow them
 // to be called from code generated by the assembler.
 class ExternalLabel : public ValueObject {
  public:
-
   ExternalLabel(const char* name, uword address)
       : name_(name), address_(address) {
     ASSERT(name != NULL);
   }
 
   const char* name() const { return name_; }
   bool is_resolved() const { return address_ != 0; }
   uword address() const {
     ASSERT(is_resolved());
     return address_;
@@ skipping 161 matching lines @@
 #include "vm/assembler_ia32.h"
 #elif defined(TARGET_ARCH_X64)
 #include "vm/assembler_x64.h"
 #elif defined(TARGET_ARCH_ARM)
 #include "vm/assembler_arm.h"
 #else
 #error Unknown architecture.
 #endif
 
 #endif  // VM_ASSEMBLER_H_