VM(RegExp): Allow OSR optimization of RegExp :matcher functions.

runtime/lib/internal_patch.dart

Index: runtime/lib/internal_patch.dart
diff --git a/runtime/lib/internal_patch.dart b/runtime/lib/internal_patch.dart
index cddf30ad4262172b81561cfa97effbde80317766..e49f5360454dc615118e9c5061904328742fe39a 100644
--- a/runtime/lib/internal_patch.dart
+++ b/runtime/lib/internal_patch.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:core' hide Symbol;
+import 'dart:typed_data' show Int32List;
 
 @patch
 List makeListFixedLength(List growableList)
@@ -64,3 +65,12 @@ class Lists {
     }
   }
 }
+
+// Called by IRRegExpMacroAssembler::GrowStack.
+Int32List _growRegExpStack(Int32List stack) {
+  final newStack = new Int32List(stack.length * 2);
+  for (int i = 0; i < stack.length; i++) {
+    newStack[i] = stack[i];
+  }
+  return newStack;
+}