[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 cb50c79a5700061a33ede87fab13f556d7f557c6..560e9293c20eae2fb7cfead79418d38ed681cbbc 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -1289,16 +1289,6 @@ Handle<Code> TransitionElementsKindStub::GenerateCode() {
   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,