Introduce CodeSourceMap object to hold pc -> token position mappings

runtime/vm/snapshot.h

 // Copyright (c) 2012, 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_SNAPSHOT_H_
 #define VM_SNAPSHOT_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
@@ skipping 25 matching lines @@
 class MegamorphicCache;
 class PageSpace;
 class RawApiError;
 class RawArray;
 class RawBigint;
 class RawBoundedType;
 class RawCapability;
 class RawClass;
 class RawClosure;
 class RawClosureData;
+class RawCodeSourceMap;
 class RawContext;
 class RawContextScope;
 class RawDouble;
 class RawExceptionHandlers;
 class RawField;
 class RawFloat32x4;
 class RawFloat64x2;
 class RawFunction;
 class RawFunctionType;
 class RawGrowableObjectArray;
@@ skipping 365 matching lines @@
   RawBoundedType* NewBoundedType();
   RawMixinAppType* NewMixinAppType();
   RawPatchClass* NewPatchClass();
   RawClosure* NewClosure();
   RawClosureData* NewClosureData();
   RawRedirectionData* NewRedirectionData();
   RawFunction* NewFunction();
   RawCode* NewCode(intptr_t pointer_offsets_length);
   RawObjectPool* NewObjectPool(intptr_t length);
   RawPcDescriptors* NewPcDescriptors(intptr_t length);
+  RawCodeSourceMap* NewCodeSourceMap(intptr_t length);
   RawLocalVarDescriptors* NewLocalVarDescriptors(intptr_t num_entries);
   RawExceptionHandlers* NewExceptionHandlers(intptr_t num_entries);
   RawStackmap* NewStackmap(intptr_t length);
   RawContextScope* NewContextScope(intptr_t num_variables);
   RawICData* NewICData();
   RawMegamorphicCache* NewMegamorphicCache();
   RawSubtypeTestCache* NewSubtypeTestCache();
   RawLinkedHashMap* NewLinkedHashMap();
   RawField* NewField();
   RawLibrary* NewLibrary();
@@ skipping 696 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_