Use a dictionary-mode code cache on the map rather than a dual system.

src/ic/mips/stub-cache-mips.cc

Index: src/ic/mips/stub-cache-mips.cc
diff --git a/src/ic/mips/stub-cache-mips.cc b/src/ic/mips/stub-cache-mips.cc
index 039763c4cfda34feb83735188e264b40dda4aa6a..f7f7957ef01258ec4812ac0236927e025543c938 100644
--- a/src/ic/mips/stub-cache-mips.cc
+++ b/src/ic/mips/stub-cache-mips.cc
@@ -97,9 +97,6 @@ void StubCache::GenerateProbe(MacroAssembler* masm, Code::Kind ic_kind,
   // entry size being 12.
   DCHECK(sizeof(Entry) == 12);
 
-  // Make sure the flags does not name a specific type.
-  DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
-
   // Make sure that there are no register conflicts.
   DCHECK(!AreAliased(receiver, name, scratch, extra, extra2, extra3));