Introduce runtime/platform directory for code shared between vm

runtime/vm/code_index_table.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_CODE_INDEX_TABLE_H_
 #define VM_CODE_INDEX_TABLE_H_
 
 #include "vm/assert.h"
 #include "vm/globals.h"
 
@@ skipping 74 matching lines @@
       length_ += 1;
     }
     void Resize(int new_capacity) {
       ASSERT(new_capacity > capacity_);
       T* new_data = reinterpret_cast<T*>(realloc(reinterpret_cast<void*>(data_),
                                                  new_capacity * sizeof(T)));
       ASSERT(new_data != NULL);
       data_ = new_data;
       capacity_ = new_capacity;
     }
+
    private:
     intptr_t length_;
     intptr_t capacity_;
     T* data_;
     DISALLOW_COPY_AND_ASSIGN(IndexArray);
   };
 
   // PC range for a function.
   typedef struct {
     uword entrypoint;  // Entry point for the function.
@@ skipping 56 matching lines @@
   RawArray* code_lists_;  // Array of pointers to code lists (arrays).
   IndexArray<PcRange>* largecode_pc_ranges_;  // pc ranges of large codes.
   RawArray* largecode_list_;  // Array of pointer to large code objects.
 
   DISALLOW_COPY_AND_ASSIGN(CodeIndexTable);
 };
 
 }  // namespace dart
 
 #endif  // VM_CODE_INDEX_TABLE_H_