Replace DeoptimizeOnUndefined with whitelisting AllowUndefinedAsNan

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 4018bcb7a6aedf2feb649ff2cc47943715f53ef2..543c1b4193d875bc783b29643eaea29de6c09a0a 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -790,7 +790,7 @@ class HValue: public ZoneObject {
     kCanOverflow,
     kBailoutOnMinusZero,
     kCanBeDivByZero,
-    kDeoptimizeOnUndefined,
+    kAllowUndefinedAsNaN,
     kIsArguments,
     kTruncatingToInt32,
     // Set after an instruction is killed.
@@ -1712,14 +1712,14 @@ class HChange: public HUnaryOperation {
   HChange(HValue* value,
           Representation to,
           bool is_truncating,
-          bool deoptimize_on_undefined)
+          bool allow_undefined_as_nan)
       : HUnaryOperation(value) {
     ASSERT(!value->representation().IsNone());
     ASSERT(!to.IsNone());
     ASSERT(!value->representation().Equals(to));
     set_representation(to);
     SetFlag(kUseGVN);
-    if (deoptimize_on_undefined) SetFlag(kDeoptimizeOnUndefined);
+    if (allow_undefined_as_nan) SetFlag(kAllowUndefinedAsNaN);
     if (is_truncating) SetFlag(kTruncatingToInt32);
     if (value->representation().IsSmi() || value->type().IsSmi()) {
       set_type(HType::Smi());
@@ -1735,8 +1735,8 @@ class HChange: public HUnaryOperation {
 
   Representation from() const { return value()->representation(); }
   Representation to() const { return representation(); }
-  bool deoptimize_on_undefined() const {
-    return CheckFlag(kDeoptimizeOnUndefined);
+  bool allow_undefined_as_nan() const {
+    return CheckFlag(kAllowUndefinedAsNaN);
   }
   bool deoptimize_on_minus_zero() const {
     return CheckFlag(kBailoutOnMinusZero);
@@ -1766,6 +1766,7 @@ class HClampToUint8: public HUnaryOperation {
   explicit HClampToUint8(HValue* value)
       : HUnaryOperation(value) {
     set_representation(Representation::Integer32());
+    SetFlag(kAllowUndefinedAsNaN);
     SetFlag(kUseGVN);
   }
 
@@ -2492,6 +2493,7 @@ class HBitNot: public HUnaryOperation {
     set_representation(Representation::Integer32());
     SetFlag(kUseGVN);
     SetFlag(kTruncatingToInt32);
+    SetFlag(kAllowUndefinedAsNaN);
   }
 
   virtual Representation RequiredInputRepresentation(int index) {
@@ -2601,6 +2603,7 @@ class HUnaryMathOperation: public HTemplateInstruction<2> {
         UNREACHABLE();
     }
     SetFlag(kUseGVN);
+    SetFlag(kAllowUndefinedAsNaN);
   }
 
   virtual bool IsDeletable() const { return true; }
@@ -2942,6 +2945,7 @@ class HPhi: public HValue {
     }
     ASSERT(merged_index >= 0);
     SetFlag(kFlexibleRepresentation);
+    SetFlag(kAllowUndefinedAsNaN);
   }
 
   virtual Representation RepresentationFromInputs();
@@ -3665,6 +3669,7 @@ class HBitwiseBinaryOperation: public HBinaryOperation {
       : HBinaryOperation(context, left, right) {
     SetFlag(kFlexibleRepresentation);
     SetFlag(kTruncatingToInt32);
+    SetFlag(kAllowUndefinedAsNaN);
     SetAllSideEffects();
   }
 
@@ -3719,6 +3724,7 @@ class HMathFloorOfDiv: public HBinaryOperation {
     if (!right->IsConstant()) {
       SetFlag(kCanBeDivByZero);
     }
+    SetFlag(kAllowUndefinedAsNaN);
   }
 
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);
@@ -3743,6 +3749,7 @@ class HArithmeticBinaryOperation: public HBinaryOperation {
       : HBinaryOperation(context, left, right) {
     SetAllSideEffects();
     SetFlag(kFlexibleRepresentation);
+    SetFlag(kAllowUndefinedAsNaN);
   }
 
   virtual void RepresentationChanged(Representation to) {
@@ -5728,12 +5735,11 @@ class HStoreKeyed
     }
     if (is_external()) {
       SetGVNFlag(kChangesSpecializedArrayElements);
+      SetFlag(kAllowUndefinedAsNaN);
     } else if (IsFastDoubleElementsKind(elements_kind)) {
       SetGVNFlag(kChangesDoubleArrayElements);
-      SetFlag(kDeoptimizeOnUndefined);
     } else if (IsFastSmiElementsKind(elements_kind)) {
       SetGVNFlag(kChangesArrayElements);
-      SetFlag(kDeoptimizeOnUndefined);
     } else {
       SetGVNFlag(kChangesArrayElements);
     }