[ic] Remove unused ICStateField.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f7e6e0b10745ad7664ba288223e5f632042233a6..71f93394988a348397ecd38a18651e22e111bf2e 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5404,9 +5404,7 @@ class Code: public HeapObject {
   class ProfilerTicksField : public BitField<int, 4, 28> {};
 
   // Flags layout.  BitField<type, shift, size>.
-  class ICStateField : public BitField<InlineCacheState, 0, 2> {};
-  class HasUnwindingInfoField : public BitField<bool, ICStateField::kNext, 1> {
-  };
+  class HasUnwindingInfoField : public BitField<bool, 0, 1> {};
   class CacheHolderField
       : public BitField<CacheHolderFlag, HasUnwindingInfoField::kNext, 2> {};
   class KindField : public BitField<Kind, CacheHolderField::kNext, 5> {};