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

src/ic/mips64/stub-cache-mips64.cc

Index: src/ic/mips64/stub-cache-mips64.cc
diff --git a/src/ic/mips64/stub-cache-mips64.cc b/src/ic/mips64/stub-cache-mips64.cc
index 0bd7dd0f2d42fc746b41339635e82351d9605305..8a2419e6e86ef79ce1368c53464b637b76617036 100644
--- a/src/ic/mips64/stub-cache-mips64.cc
+++ b/src/ic/mips64/stub-cache-mips64.cc
@@ -100,9 +100,6 @@ void StubCache::GenerateProbe(MacroAssembler* masm, Code::Kind ic_kind,
   // DCHECK(sizeof(Entry) == 12);
   // DCHECK(sizeof(Entry) == 3 * kPointerSize);
 
-  // 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));