Use one offsets table per generated irregexp matching function.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
diff --git a/runtime/vm/compiler.cc b/runtime/vm/compiler.cc
index fe9b484a41334cb18585c661e2f7275b7a3a855d..139c02d13f7d91c615bad274bf70abaae8169254 100644
--- a/runtime/vm/compiler.cc
+++ b/runtime/vm/compiler.cc
@@ -110,7 +110,7 @@ class DefaultCompilationPipeline : public CompilationPipeline {
 class IrregexpCompilationPipeline : public DefaultCompilationPipeline {
  public:
   explicit IrregexpCompilationPipeline(Isolate* isolate)
-    : macro_assembler_(NULL),
+    : graph_entry_(NULL),
       isolate_(isolate) { }
 
   virtual void ParseFunction(ParsedFunction* parsed_function) {
@@ -127,7 +127,6 @@ class IrregexpCompilationPipeline : public DefaultCompilationPipeline {
         RegExpEngine::Compile(parsed_function->regexp_compile_data(),
                               parsed_function,
                               ic_data_array);
-    macro_assembler_ = result.macro_assembler;
 
     // Allocate variables now that we know the number of locals.
     parsed_function->AllocateIrregexpVariables(result.num_stack_locals);
@@ -138,17 +137,20 @@ class IrregexpCompilationPipeline : public DefaultCompilationPipeline {
                              NULL,  // NULL = not inlining.
                              osr_id);
 
+    // Store the graph entry for later finalization.
+    graph_entry_ = result.graph_entry;
+
     return new(isolate_) FlowGraph(builder,
                                    result.graph_entry,
                                    result.num_blocks);
   }
 
   virtual void FinalizeCompilation() {
-    macro_assembler_->FinalizeBlockOffsetTable();
+    IRRegExpMacroAssembler::FinalizeBlockOffsetTable(isolate_, graph_entry_);
   }
 
  private:
-  IRRegExpMacroAssembler* macro_assembler_;
+  GraphEntryInstr* graph_entry_;
   Isolate* isolate_;
 };