[coverage] Block coverage with support for IfStatements

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 486873f6f580dc225203f9ead60b34808c520012..ceaaae2e0d2edba8770f0238e8a4ecc8e23a8fa6 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1002,6 +1002,7 @@ template <class C> inline bool Is(Object* obj);
   V(ConstantElementsPair)              \
   V(Constructor)                       \
   V(Context)                           \
+  V(CoverageInfo)                      \
   V(DeoptimizationInputData)           \
   V(DeoptimizationOutputData)          \
   V(DependentCode)                     \
@@ -1579,6 +1580,10 @@ class Smi: public Object {
  public:
   // Returns the integer value.
   inline int value() const { return Internals::SmiValue(this); }
+
+  // Casts o to a Smi and returns its value.
+  static inline int ToInt(Object* o);
+
   inline Smi* ToUint32Smi() {
     if (value() <= 0) return Smi::kZero;
     return Smi::FromInt(static_cast<uint32_t>(value()));