Crankshaft support for StringCharFromCode.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 6c516f2497e01ae6e63a9cca6f241d55d2929172..3c5b0501503a3c986915763ad4e8f04da40dc69a 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -151,6 +151,7 @@ class LChunkBuilder;
   V(StoreNamedField)                           \
   V(StoreNamedGeneric)                         \
   V(StringCharCodeAt)                          \
+  V(StringCharFromCode)                        \
   V(StringLength)                              \
   V(Sub)                                       \
   V(Test)                                      \
@@ -3258,6 +3259,23 @@ class HStringCharCodeAt: public HBinaryOperation {
 };
 
 
+class HStringCharFromCode: public HUnaryOperation {
+ public:
+  explicit HStringCharFromCode(HValue* char_code) : HUnaryOperation(char_code) {
+    set_representation(Representation::Tagged());
+    SetFlag(kUseGVN);
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Integer32();
+  }
+
+  virtual bool DataEquals(HValue* other) { return true; }
+
+  DECLARE_CONCRETE_INSTRUCTION(StringCharFromCode, "string_char_from_code")
+};
+
+
 class HStringLength: public HUnaryOperation {
  public:
   explicit HStringLength(HValue* string) : HUnaryOperation(string) {