Make compiler more acceptive wrt Isolate::use_crankshaft.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 10e45b510b734fe951f995e8792482d97caded3c..ae69d811ec1bace6ed2dba0bbe73a5d494b79217 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9602,7 +9602,6 @@ void JSFunction::JSFunctionIterateBody(int object_size, ObjectVisitor* v) {
 
 void JSFunction::MarkForOptimization() {
   Isolate* isolate = GetIsolate();
-  DCHECK(isolate->use_crankshaft());
   DCHECK(!IsOptimized());
   DCHECK(shared()->allows_lazy_compilation() || code()->optimizable());
   set_code_no_write_barrier(
@@ -9626,7 +9625,6 @@ void JSFunction::AttemptConcurrentOptimization() {
     // recompilation race.  This goes away as soon as OSR becomes one-shot.
     return;
   }
-  DCHECK(isolate->use_crankshaft());
   DCHECK(!IsInOptimizationQueue());
   DCHECK(is_compiled() || isolate->debug()->has_break_points());
   DCHECK(!IsOptimized());