Reland r20974: Unify and simplify the FastCloneShallowArrayStub

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index 24f60ed412972ed586ba209477b12432e196134a..64fb3eb705bf7e5047e6a572694c5c9a37e716ac 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -22,6 +22,7 @@ CodeStubInterfaceDescriptor::CodeStubInterfaceDescriptor()
       hint_stack_parameter_count_(-1),
       function_mode_(NOT_JS_FUNCTION_STUB_MODE),
       register_params_(NULL),
+      register_param_representations_(NULL),
       deoptimization_handler_(NULL),
       handler_arguments_mode_(DONT_PASS_ARGUMENTS),
       miss_handler_(),
@@ -733,9 +734,7 @@ void FastNewContextStub::InstallDescriptors(Isolate* isolate) {
 
 // static
 void FastCloneShallowArrayStub::InstallDescriptors(Isolate* isolate) {
-  FastCloneShallowArrayStub stub(isolate,
-                                 FastCloneShallowArrayStub::CLONE_ELEMENTS,
-                                 DONT_TRACK_ALLOCATION_SITE, 0);
+  FastCloneShallowArrayStub stub(isolate, DONT_TRACK_ALLOCATION_SITE);
   InstallDescriptor(isolate, &stub);
 }