Rollback trunk to 3.21.16.2

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index aed2b4bd289df6283dc57de79844f4eeb1f3f838..7d33141a4f61c150320d02aaceb2c74218506b66 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -128,6 +128,7 @@ class LChunkBuilder;
   V(InvokeFunction)                            \
   V(IsConstructCallAndBranch)                  \
   V(IsObjectAndBranch)                         \
+  V(IsNumberAndBranch)                         \
   V(IsStringAndBranch)                         \
   V(IsSmiAndBranch)                            \
   V(IsUndetectableAndBranch)                   \
@@ -781,15 +782,11 @@ class HValue : public ZoneObject {
   // phase (so that live ranges will be shorter).
   virtual bool IsPurelyInformativeDefinition() { return false; }
 
-  // This method must always return the original HValue SSA definition,
-  // regardless of any chain of iDefs of this value.
+  // This method must always return the original HValue SSA definition
+  // (regardless of any iDef of this value).
   HValue* ActualValue() {
-    HValue* value = this;
-    int index;
-    while ((index = value->RedefinedOperandIndex()) != kNoRedefinedOperand) {
-      value = value->OperandAt(index);
-    }
-    return value;
+    int index = RedefinedOperandIndex();
+    return index == kNoRedefinedOperand ? this : OperandAt(index);
   }
 
   bool IsInteger32Constant();
@@ -1306,8 +1303,6 @@ class HDeoptimize V8_FINAL : public HTemplateInstruction<0> {
 // Inserts an int3/stop break instruction for debugging purposes.
 class HDebugBreak V8_FINAL : public HTemplateInstruction<0> {
  public:
-  DECLARE_INSTRUCTION_FACTORY_P0(HDebugBreak);
-
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
     return Representation::None();
   }
@@ -2789,6 +2784,21 @@ class HCheckSmi V8_FINAL : public HUnaryOperation {
 };
 
 
+class HIsNumberAndBranch V8_FINAL : public HUnaryControlInstruction {
+ public:
+  explicit HIsNumberAndBranch(HValue* value)
+    : HUnaryControlInstruction(value, NULL, NULL) {
+    SetFlag(kFlexibleRepresentation);
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
+    return Representation::None();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(IsNumberAndBranch)
+};
+
+
 class HCheckHeapObject V8_FINAL : public HUnaryOperation {
  public:
   DECLARE_INSTRUCTION_FACTORY_P1(HCheckHeapObject, HValue*);