Fix r23638 "Convert Linkage to use MachineSignature." for crankshaft only architectures.

BUG=
R=paul.lind@imgtec.com, titzer@chromium.org

Review URL: https://codereview.chromium.org/538553002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23665 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/linkage.cc

@@ -155,9 +155,8 @@ CallDescriptor* Linkage::GetStubCallDescriptor(
 }
 
 
-CallDescriptor* Linkage::GetSimplifiedCDescriptor(
-    Zone* zone, int num_params, MachineType return_type,
-    const MachineType* param_types) {
+CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
+                                                  MachineSignature* sig) {
   UNIMPLEMENTED();
   return NULL;
 }