Revert of [turbofan] Run everything after representation selection concurrently.

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 560e9293c20eae2fb7cfead79418d38ed681cbbc..cb50c79a5700061a33ede87fab13f556d7f557c6 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -1289,6 +1289,16 @@
   return DoGenerateCode(this);
 }
 
+template <>
+HValue* CodeStubGraphBuilder<AllocateStub>::BuildCodeStub() {
+  HValue* result =
+      Add<HAllocate>(GetParameter(0), HType::Tagged(),
+                     casted_stub()->pretenure_flag(), JS_OBJECT_TYPE);
+  return result;
+}
+
+Handle<Code> AllocateStub::GenerateCode() { return DoGenerateCode(this); }
+
 HValue* CodeStubGraphBuilderBase::BuildArrayConstructor(
     ElementsKind kind,
     AllocationSiteOverrideMode override_mode,