[turbofan] Remove remnants from JavaScript stubs support.

This removes some leftover code which avoided adding stack checks to
stubs being compiled via the normal JavaScript pipeline, which we no
longer do.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2333973003
Cr-Commit-Position: refs/heads/master@{#39404}

src/compiler/pipeline.cc

@@ -448,9 +448,9 @@ class AstGraphBuilderWithPositions final : public AstGraphBuilder {
         source_positions_(source_positions),
         start_position_(info->shared_info()->start_position()) {}
 
-  bool CreateGraph(bool stack_check) {
+  bool CreateGraph() {
     SourcePositionTable::Scope pos_scope(source_positions_, start_position_);
-    return AstGraphBuilder::CreateGraph(stack_check);
+    return AstGraphBuilder::CreateGraph();
   }
 
 #define DEF_VISIT(type)                                               \
@@ -764,7 +764,6 @@ struct GraphBuilderPhase {
   static const char* phase_name() { return "graph builder"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
-    bool stack_check = !data->info()->IsStub();
     bool succeeded = false;
 
     if (data->info()->is_optimizing_from_bytecode()) {
@@ -775,7 +774,7 @@ struct GraphBuilderPhase {
       AstGraphBuilderWithPositions graph_builder(
           temp_zone, data->info(), data->jsgraph(), data->loop_assignment(),
           data->type_hint_analysis(), data->source_positions());
-      succeeded = graph_builder.CreateGraph(stack_check);
+      succeeded = graph_builder.CreateGraph();
     }
 
     if (!succeeded) {