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

src/compiler/linkage.cc

Index: src/compiler/linkage.cc
diff --git a/src/compiler/linkage.cc b/src/compiler/linkage.cc
index adeeccb08fbadda1f28f7c7ca9f277990bbebe26..9fac9c347307a8cf3a13dad3251fb7f4a1043598 100644
--- a/src/compiler/linkage.cc
+++ b/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;
 }