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

src/disassembler.cc

Index: src/disassembler.cc
diff --git a/src/disassembler.cc b/src/disassembler.cc
index ed9ca9ac662159279f1a044d762752be292c063a..e7c2c4eb43b3a788cedce04ac7088b29809acd71 100644
--- a/src/disassembler.cc
+++ b/src/disassembler.cc
@@ -203,10 +203,6 @@ static int DecodeIt(Isolate* isolate, std::ostream* os,
           InlineCacheState ic_state = code->ic_state();
           out.AddFormatted(" %s, %s", Code::Kind2String(kind),
               Code::ICState2String(ic_state));
-          if (ic_state == MONOMORPHIC) {
-            Code::StubType type = code->type();
-            out.AddFormatted(", %s", Code::StubType2String(type));
-          }
         } else if (kind == Code::STUB || kind == Code::HANDLER) {
           // Get the STUB key and extract major and minor key.
           uint32_t key = code->stub_key();