Fix code dependency change assertion.

During bootstapping installing native functions may cause
map transitions. There are no dependent code groups, but
the assertion still triggers.

BUG=chromium:617892

Change-Id: Id7cb87575a0fe176e7aff785d4dd249db44deec8
Reviewed-on: https://chromium-review.googlesource.com/457036Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43898}

src/objects.cc

@@ -15068,10 +15068,12 @@ bool DependentCode::MarkCodeForDeoptimization(
 void DependentCode::DeoptimizeDependentCodeGroup(
     Isolate* isolate,
     DependentCode::DependencyGroup group) {
-  DCHECK(AllowCodeDependencyChange::IsAllowed());
   DisallowHeapAllocation no_allocation_scope;
   bool marked = MarkCodeForDeoptimization(isolate, group);
-  if (marked) Deoptimizer::DeoptimizeMarkedCode(isolate);
+  if (marked) {
+    DCHECK(AllowCodeDependencyChange::IsAllowed());
+    Deoptimizer::DeoptimizeMarkedCode(isolate);
+  }
 }