Make whether or not a Code object should be created by masm explicit

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index 5434065314d9277df6d7fca33971269330fe2c20..97013debfb0779bf961d298a39266f09b1846c4c 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -55,6 +55,9 @@ class StatsCounter;
 // -----------------------------------------------------------------------------
 // Platform independent assembler base class.
 
+enum class CodeObjectRequired { kNo, kYes };
+
+
 class AssemblerBase: public Malloced {
  public:
   AssemblerBase(Isolate* isolate, void* buffer, int buffer_size);