[turbofan] add configuration parameters for register allocator

src/compiler/linkage.h

Index: src/compiler/linkage.h
diff --git a/src/compiler/linkage.h b/src/compiler/linkage.h
index cc5be9ba621d7dd91345d04d3214a8a0d10d8334..d11fa124681214fcb37e55d0b912eb26ae0e1c84 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -6,15 +6,16 @@
 #define V8_COMPILER_LINKAGE_H_
 
 #include "src/base/flags.h"
-#include "src/code-stubs.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/machine-type.h"
-#include "src/compiler/node.h"
 #include "src/compiler/operator.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
+
+class CallInterfaceDescriptor;
+
 namespace compiler {
 
 // Describes the location for a parameter or a return value to a call.
@@ -183,10 +184,10 @@ class Linkage : public ZoneObject {
       Operator::Properties properties, Zone* zone);
 
   CallDescriptor* GetStubCallDescriptor(
-      CallInterfaceDescriptor descriptor, int stack_parameter_count = 0,
+      const CallInterfaceDescriptor& descriptor, int stack_parameter_count = 0,
       CallDescriptor::Flags flags = CallDescriptor::kNoFlags) const;
   static CallDescriptor* GetStubCallDescriptor(
-      CallInterfaceDescriptor descriptor, int stack_parameter_count,
+      const CallInterfaceDescriptor& descriptor, int stack_parameter_count,
       CallDescriptor::Flags flags, Zone* zone);
 
   // Creates a call descriptor for simplified C calls that is appropriate