[GC] Fix code flushing to use bytecode if it exists.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 51247a92e312edc231f3ec97cd67e2ffb6eca369..aae3b9af6a0dda2ba37481088292a3b8d828834e 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6244,6 +6244,10 @@ Code* SharedFunctionInfo::code() const {
 
 void SharedFunctionInfo::set_code(Code* value, WriteBarrierMode mode) {
   DCHECK(value->kind() != Code::OPTIMIZED_FUNCTION);
+  // If the SharedFunctionInfo has bytecode we should never mark it for lazy
+  // compile, since the bytecode is never flushed.
+  DCHECK(value != GetIsolate()->builtins()->builtin(Builtins::kCompileLazy) ||
+         !HasBytecodeArray());
   WRITE_FIELD(this, kCodeOffset, value);
   CONDITIONAL_WRITE_BARRIER(value->GetHeap(), this, kCodeOffset, value, mode);
 }