Revert "Add Smi::Zero and replace all Smi::FromInt(0) calls"

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index d3b20c35cacbf29cec9c246a138e31d448ad100c..322dccac1ae614ead5b2b2883a4693aa125c50bf 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1510,7 +1510,6 @@ class Smi: public Object {
   void SmiPrint(std::ostream& os) const;  // NOLINT
   DECLARE_VERIFIER(Smi)
 
-  static Smi* const kZero;
   static const int kMinValue =
       (static_cast<unsigned int>(-1)) << (kSmiValueSize - 1);
   static const int kMaxValue = -(kMinValue + 1);
@@ -2873,7 +2872,7 @@ class WeakFixedArray : public FixedArray {
   inline int Length() const;
 
   inline bool IsEmptySlot(int index) const;
-  static Object* Empty() { return Smi::kZero; }
+  static Object* Empty() { return Smi::FromInt(0); }
 
   class Iterator {
    public:
@@ -11212,7 +11211,7 @@ class DebugInfo: public Struct {
   // Get the number of break points for this function.
   int GetBreakPointCount();
 
-  static Smi* uninitialized() { return Smi::kZero; }
+  static Smi* uninitialized() { return Smi::FromInt(0); }
 
   inline bool HasDebugBytecodeArray();
   inline bool HasDebugCode();