Merge up to bleeding_edge r7201 to isolates branch.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index e3613ab84f356e3d189391c67a0058ab4b9c8af3..09c7d80e393217e4d7d7d19712af352a7e65dd45 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)                                      \
@@ -2563,6 +2564,16 @@ class HMod: public HArithmeticBinaryOperation {
     SetFlag(kCanBeDivByZero);
   }
 
+  bool HasPowerOf2Divisor() {
+    if (right()->IsConstant() &&
+        HConstant::cast(right())->HasInteger32Value()) {
+      int32_t value = HConstant::cast(right())->Integer32Value();
+      return value != 0 && (IsPowerOf2(value) || IsPowerOf2(-value));
+    }
+
+    return false;
+  }
+
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);
 
   DECLARE_CONCRETE_INSTRUCTION(Mod, "mod")
@@ -3254,6 +3265,23 @@ 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) {