[cleanup] Remove instanceof cache.

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index b6a9887c62e80d5937d765873dccad01a0537d7d..71974d94204ab39cb29ce68941bfa900a17e4e8e 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -753,19 +753,10 @@ void Heap::ExternalStringTable::ShrinkNewStrings(int position) {
 #endif
 }
 
-void Heap::ClearInstanceofCache() { set_instanceof_cache_function(Smi::kZero); }
-
 Oddball* Heap::ToBoolean(bool condition) {
   return condition ? true_value() : false_value();
 }
 
-
-void Heap::CompletelyClearInstanceofCache() {
-  set_instanceof_cache_map(Smi::kZero);
-  set_instanceof_cache_function(Smi::kZero);
-}
-
-
 uint32_t Heap::HashSeed() {
   uint32_t seed = static_cast<uint32_t>(hash_seed()->value());
   DCHECK(FLAG_randomize_hashes || seed == 0);