Move the Kernel string offsets into the VM's heap.

runtime/vm/kernel_binary_flowgraph.h

Index: runtime/vm/kernel_binary_flowgraph.h
diff --git a/runtime/vm/kernel_binary_flowgraph.h b/runtime/vm/kernel_binary_flowgraph.h
index 3fd552d3faa4a27f572acdf9b93546658ebada32..d2ce8474055bfe7d57878bc4399a205f463ebdf8 100644
--- a/runtime/vm/kernel_binary_flowgraph.h
+++ b/runtime/vm/kernel_binary_flowgraph.h
@@ -65,8 +65,6 @@ class StreamingFlowGraphBuilder {
                             flow_graph_builder->zone_,
                             &flow_graph_builder->translation_helper_,
                             &flow_graph_builder->type_translator_),
-        string_offset_count_(0),
-        string_offsets_(NULL),
         canonical_names_(NULL),
         canonical_names_size_(-1),
         canonical_names_entries_read_(0),
@@ -74,7 +72,6 @@ class StreamingFlowGraphBuilder {
 
   virtual ~StreamingFlowGraphBuilder() {
     delete reader_;
-    delete[] string_offsets_;
     // The canonical names themselves are not (yet) deallocated.
     delete[] canonical_names_;
   }
@@ -82,7 +79,6 @@ class StreamingFlowGraphBuilder {
   Fragment BuildAt(intptr_t kernel_offset);
 
  private:
-  intptr_t GetStringOffset(intptr_t index);
   CanonicalName* GetCanonicalName(intptr_t index);
 
   intptr_t ReaderOffset();
@@ -97,10 +93,6 @@ class StreamingFlowGraphBuilder {
   ScopeBuildingResult* scopes();
   ParsedFunction* parsed_function();
 
-  dart::String& DartSymbol(intptr_t str_index);
-  dart::String& DartString(intptr_t str_index);
-  String* KernelString(intptr_t str_index);
-
   Fragment DebugStepCheck(TokenPosition position);
   Fragment LoadLocal(LocalVariable* variable);
   Fragment PushArgument();
@@ -132,19 +124,6 @@ class StreamingFlowGraphBuilder {
   kernel::Reader* reader_;
   StreamingConstantEvaluator constant_evaluator_;
 
-  // We build a table that gives us the start and end offsets of all the strings
-  // in the binary.
-  //
-  // The number of string offsets.  Note that this is one more than the number
-  // of strings in the binary.
-  intptr_t string_offset_count_;
-
-  // An array of offsets of size string_table_size_ + 1, in order to include the
-  // end offset of the last string.  The string with index N consists of the
-  // UTF-8 encoded bytes stretching from string_table_offsets_[N] (enclusive) to
-  // string_table_offsets_[N+1] (exclusive).
-  intptr_t* string_offsets_;
-
   CanonicalName** canonical_names_;
   intptr_t canonical_names_size_;
   intptr_t canonical_names_entries_read_;