Support StringCharCodeAt in hydrogen/lithium.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index cca07c8c8b42aeeb8c13938dc37bacbd0e753cdd..799e077a330e37fa51443881bd67d402ca8cdd2a 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1741,6 +1741,20 @@ LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoStringCharCodeAt(HStringCharCodeAt* instr) {
+  LOperand* string = UseRegister(instr->string());
+  LOperand* index = UseRegisterOrConstant(instr->index());
+  return AssignEnvironment(AssignPointerMap(DefineAsRegister(
+      new LStringCharCodeAt(string, index))));
+}
+
+
+LInstruction* LChunkBuilder::DoStringLength(HStringLength* instr) {
+  LOperand* string = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new LStringLength(string));
+}
+
+
 LInstruction* LChunkBuilder::DoArrayLiteral(HArrayLiteral* instr) {
   return MarkAsCall(DefineFixed(new LArrayLiteral, eax), instr);
 }