JIT precompilated snapshots.

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index 9f1f4fcf61859aa226949f87fecb0ccb4e7c0dc9..30dfb090abe42eff252afe3a79b62715edaa6bd7 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -721,6 +721,7 @@ class RawClass : public RawObject {
       case Snapshot::kAppNoJIT:
         return reinterpret_cast<RawObject**>(&ptr()->direct_subclasses_);
       case Snapshot::kMessage:
+      case Snapshot::kNone:
         break;
     }
     UNREACHABLE();
@@ -949,6 +950,7 @@ class RawField : public RawObject {
       case Snapshot::kAppNoJIT:
         return reinterpret_cast<RawObject**>(&ptr()->initializer_);
       case Snapshot::kMessage:
+      case Snapshot::kNone:
         break;
     }
     UNREACHABLE();
@@ -1029,6 +1031,7 @@ class RawScript : public RawObject {
       case Snapshot::kScript:
         return reinterpret_cast<RawObject**>(&ptr()->tokens_);
       case Snapshot::kMessage:
+      case Snapshot::kNone:
         break;
     }
     UNREACHABLE();
@@ -1120,12 +1123,10 @@ class RawCode : public RawObject {
   uword entry_point_;
 
   RawObject** from() {
-    return reinterpret_cast<RawObject**>(&ptr()->instructions_);
+    return reinterpret_cast<RawObject**>(&ptr()->active_instructions_);
   }
-  union {
-    RawInstructions* instructions_;
-    RawSmi* precompiled_instructions_size_;
-  };
+  RawInstructions* active_instructions_;
+  RawInstructions* instructions_;
   RawObjectPool* object_pool_;
   // If owner_ is Function::null() the owner is a regular stub.
   // If owner_ is a Class the owner is the allocation stub for that class.
@@ -1517,6 +1518,7 @@ class RawICData : public RawObject {
       case Snapshot::kAppWithJIT:
         return to();
       case Snapshot::kMessage:
+      case Snapshot::kNone:
         break;
     }
     UNREACHABLE();
@@ -1648,6 +1650,7 @@ class RawLibraryPrefix : public RawInstance {
       case Snapshot::kAppNoJIT:
         return reinterpret_cast<RawObject**>(&ptr()->importer_);
       case Snapshot::kMessage:
+      case Snapshot::kNone:
         break;
     }
     UNREACHABLE();