Convert Linkage to use MachineSignature.

src/compiler/x64/linkage-x64.cc

Index: src/compiler/x64/linkage-x64.cc
diff --git a/src/compiler/x64/linkage-x64.cc b/src/compiler/x64/linkage-x64.cc
index f58c6bca71aa6f56a192b456061df31cb079cdd0..c721cbb4b7c27a146e84e432ff6fcb658da91fab 100644
--- a/src/compiler/x64/linkage-x64.cc
+++ b/src/compiler/x64/linkage-x64.cc
@@ -20,7 +20,7 @@ const bool kWin64 = true;
 const bool kWin64 = false;
 #endif
 
-struct LinkageHelperTraits {
+struct X64LinkageHelperTraits {
   static Register ReturnValueReg() { return rax; }
   static Register ReturnValue2Reg() { return rdx; }
   static Register JSCallFunctionReg() { return rdi; }
@@ -47,10 +47,10 @@ struct LinkageHelperTraits {
   static int CRegisterParametersLength() { return kWin64 ? 4 : 6; }
 };
 
+typedef LinkageHelper<X64LinkageHelperTraits> LH;
 
 CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count, Zone* zone) {
-  return LinkageHelper::GetJSCallDescriptor<LinkageHelperTraits>(
-      zone, parameter_count);
+  return LH::GetJSCallDescriptor(zone, parameter_count);
 }
 
 
@@ -59,24 +59,22 @@ CallDescriptor* Linkage::GetRuntimeCallDescriptor(Runtime::FunctionId function,
                                                   Operator::Property properties,
                                                   CallDescriptor::Flags flags,
                                                   Zone* zone) {
-  return LinkageHelper::GetRuntimeCallDescriptor<LinkageHelperTraits>(
-      zone, function, parameter_count, properties, flags);
+  return LH::GetRuntimeCallDescriptor(zone, function, parameter_count,
+                                      properties, flags);
 }
 
 
 CallDescriptor* Linkage::GetStubCallDescriptor(
     CodeStubInterfaceDescriptor* descriptor, int stack_parameter_count,
     CallDescriptor::Flags flags, Zone* zone) {
-  return LinkageHelper::GetStubCallDescriptor<LinkageHelperTraits>(
-      zone, descriptor, stack_parameter_count, flags);
+  return LH::GetStubCallDescriptor(zone, descriptor, stack_parameter_count,
+                                   flags);
 }
 
 
-CallDescriptor* Linkage::GetSimplifiedCDescriptor(
-    Zone* zone, int num_params, MachineType return_type,
-    const MachineType* param_types) {
-  return LinkageHelper::GetSimplifiedCDescriptor<LinkageHelperTraits>(
-      zone, num_params, return_type, param_types);
+CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
+                                                  MachineSignature* sig) {
+  return LH::GetSimplifiedCDescriptor(zone, sig);
 }
 
 }