Precompilation: don't include an object header for instructions in the text section.

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index 9c07dc0f947be33102c7cd2720e273f5ec1ee5ff..2db814e4427d80c6a8c2d4919d0fe49aad4dac46 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -164,9 +164,7 @@ const char* Dart::InitOnce(const uint8_t* vm_isolate_snapshot,
       StubCode::InitOnce();
     }
     if (vm_isolate_snapshot != NULL) {
-      if (instructions_snapshot != NULL) {
-        vm_isolate_->SetupInstructionsSnapshotPage(instructions_snapshot);
-        ASSERT(data_snapshot != NULL);
+      if (data_snapshot != NULL) {
         vm_isolate_->SetupDataSnapshotPage(data_snapshot);
       }
       const Snapshot* snapshot = Snapshot::SetupFromBuffer(vm_isolate_snapshot);