Use generated code to create sub strings

src/arm/codegen-arm.cc

Index: src/arm/codegen-arm.cc
===================================================================
--- src/arm/codegen-arm.cc	(revision 3551)
+++ src/arm/codegen-arm.cc	(working copy)
@@ -3451,6 +3451,18 @@
 }
 
 
+void CodeGenerator::GenerateSubString(ZoneList<Expression*>* args) {
+  ASSERT_EQ(2, args->length());
+
+  Load(args->at(0));
+  Load(args->at(1));
+  Load(args->at(2));
+
+  frame_->CallRuntime(Runtime::kSubString, 3);
+  frame_->EmitPush(r0);
+}
+
+
 void CodeGenerator::GenerateRegExpExec(ZoneList<Expression*>* args) {
   ASSERT_EQ(4, args->length());