Support StringCharCodeAt in hydrogen/lithium.

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 25182855413c81450ad7ab6fbc5da87c1bd35bc6..93124d2135bbd01ac949501ee4f837a3d50e7d29 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -105,6 +105,7 @@ class LCodeGen;
 //   LStoreNamed
 //     LStoreNamedField
 //     LStoreNamedGeneric
+//   LStringCharCodeAt
 //   LUnaryOperation
 //     LBitNotI
 //     LBranch
@@ -139,6 +140,7 @@ class LCodeGen;
 //     LReturn
 //     LSmiTag
 //     LStoreGlobal
+//     LStringLength
 //     LTaggedToI
 //     LThrow
 //     LTypeof
@@ -253,6 +255,8 @@ class LCodeGen;
   V(StoreKeyedGeneric)                          \
   V(StoreNamedField)                            \
   V(StoreNamedGeneric)                          \
+  V(StringCharCodeAt)                           \
+  V(StringLength)                               \
   V(SubI)                                       \
   V(TaggedToI)                                  \
   V(Throw)                                      \
@@ -1640,6 +1644,30 @@ class LStoreKeyedGeneric: public LStoreKeyed {
 };
 
 
+class LStringCharCodeAt: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LStringCharCodeAt(LOperand* string, LOperand* index) {
+    this->SetInputAt(0, string);
+    this->SetInputAt(1, index);
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(StringCharCodeAt, "string-char-code-at")
+  DECLARE_HYDROGEN_ACCESSOR(StringCharCodeAt)
+
+  LOperand* string() const { return this->InputAt(0); }
+  LOperand* index() const { return this->InputAt(1); }
+};
+
+
+class LStringLength: public LUnaryOperation<1> {
+ public:
+  explicit LStringLength(LOperand* string) : LUnaryOperation<1>(string) {}
+
+  DECLARE_CONCRETE_INSTRUCTION(StringLength, "string-length")
+  DECLARE_HYDROGEN_ACCESSOR(StringLength)
+};
+
+
 class LCheckFunction: public LUnaryOperation<0> {
  public:
   explicit LCheckFunction(LOperand* use) : LUnaryOperation<0>(use) { }