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

src/ic/ia32/stub-cache-ia32.cc

Index: src/ic/ia32/stub-cache-ia32.cc
diff --git a/src/ic/ia32/stub-cache-ia32.cc b/src/ic/ia32/stub-cache-ia32.cc
index fcfae4bc0ce9246f572957d17a2f8848f091ac8d..5a32858596b73b4794d3a19931f1979e4a2eafe6 100644
--- a/src/ic/ia32/stub-cache-ia32.cc
+++ b/src/ic/ia32/stub-cache-ia32.cc
@@ -153,9 +153,6 @@ void StubCache::GenerateProbe(MacroAssembler* masm, Code::Kind ic_kind,
   // being 12.
   DCHECK(sizeof(Entry) == 12);
 
-  // Assert the flags do not name a specific type.
-  DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
-
   // Assert that there are no register conflicts.
   DCHECK(!scratch.is(receiver));
   DCHECK(!scratch.is(name));