[turbofan] Add MachineType to LinkageLocation

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 96a91e2dc3ca370dcb4affe998fd4b0f539e0ccd..b55fb9bbd5bd72b38a5c27e2f8a18c9b0e493814 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -762,10 +762,7 @@ class RawMachineAssembler {
   BasicBlock* CurrentBlock();
 
   Schedule* schedule() { return schedule_; }
-  size_t parameter_count() const { return machine_sig()->parameter_count(); }
-  const MachineSignature* machine_sig() const {
-    return call_descriptor_->GetMachineSignature();
-  }
+  size_t parameter_count() const { return call_descriptor_->ParameterCount(); }
 
   Isolate* isolate_;
   Graph* graph_;