Port irregexp bytecode compiler and interpreter from V8 r24065.

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
diff --git a/runtime/vm/raw_object_snapshot.cc b/runtime/vm/raw_object_snapshot.cc
index 092ddcdadb10973b81b99aa6af4d9bbff132ba7c..057f8e94aad173404a312fd080aead519a4baf17 100644
--- a/runtime/vm/raw_object_snapshot.cc
+++ b/runtime/vm/raw_object_snapshot.cc
@@ -2980,6 +2980,8 @@ RawJSRegExp* JSRegExp::ReadFrom(SnapshotReader* reader,
                  reader->ReadAsSmi());
   *reader->StringHandle() ^= reader->ReadObjectImpl();
   regex.set_pattern(*reader->StringHandle());
+  regex.StoreNonPointer(&regex.raw_ptr()->num_registers_,
+                        reader->Read<int32_t>());
   regex.StoreNonPointer(&regex.raw_ptr()->type_flags_,
                         reader->Read<int8_t>());
 
@@ -3004,6 +3006,7 @@ void RawJSRegExp::WriteTo(SnapshotWriter* writer,
   // Write out all the other fields.
   writer->Write<RawObject*>(ptr()->num_bracket_expressions_);
   writer->WriteObjectImpl(ptr()->pattern_);
+  writer->Write<int32_t>(ptr()->num_registers_);
   writer->Write<int8_t>(ptr()->type_flags_);
 }