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

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index 7678eefbae743b2f8df4967203bafd2fa2aa5046..7ad41b13b823ab8d7d8ccd552e740e23379e9e6e 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -969,23 +969,6 @@ Isolate* Isolate::Init(const char* name_prefix,
 }
 
 
-void Isolate::SetupInstructionsSnapshotPage(
-    const uint8_t* instructions_snapshot_buffer) {
-  InstructionsSnapshot snapshot(instructions_snapshot_buffer);
-#if defined(DEBUG)
-  if (FLAG_trace_isolates) {
-    OS::Print("Precompiled instructions are at [0x%" Px ", 0x%" Px ")\n",
-              reinterpret_cast<uword>(snapshot.instructions_start()),
-              reinterpret_cast<uword>(snapshot.instructions_start()) +
-              snapshot.instructions_size());
-  }
-#endif
-  heap_->SetupExternalPage(snapshot.instructions_start(),
-                           snapshot.instructions_size(),
-                           /* is_executable = */ true);
-}
-
-
 void Isolate::SetupDataSnapshotPage(const uint8_t* data_snapshot_buffer) {
   DataSnapshot snapshot(data_snapshot_buffer);
 #if defined(DEBUG)