[turbofan] add configuration parameters for register allocator

src/compiler/linkage-impl.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_LINKAGE_IMPL_H_
 #define V8_COMPILER_LINKAGE_IMPL_H_
 
+#include "src/code-stubs.h"
+
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // TODO(titzer): replace uses of int with size_t in LinkageHelper.
 template <typename LinkageTraits>
 class LinkageHelper {
  public:
   static const RegList kNoCalleeSaved = 0;
 
@@ skipping 104 matching lines @@
                                      js_parameter_count,  // js_parameter_count
                                      properties,          // properties
                                      kNoCalleeSaved,      // callee-saved
                                      flags,               // flags
                                      function->name);     // debug name
   }
 
 
   // TODO(turbofan): cache call descriptors for code stub calls.
   static CallDescriptor* GetStubCallDescriptor(
-      Zone* zone, CallInterfaceDescriptor descriptor, int stack_parameter_count,
-      CallDescriptor::Flags flags) {
+      Zone* zone, const CallInterfaceDescriptor& descriptor,
+      int stack_parameter_count, CallDescriptor::Flags flags) {
     const int register_parameter_count =
         descriptor.GetEnvironmentParameterCount();
     const int js_parameter_count =
         register_parameter_count + stack_parameter_count;
     const int context_count = 1;
     const size_t return_count = 1;
     const size_t parameter_count =
         static_cast<size_t>(js_parameter_count + context_count);
 
     LocationSignature::Builder locations(zone, return_count, parameter_count);
@@ skipping 73 matching lines @@
   static LinkageLocation stackloc(int i) {
     DCHECK_LT(i, 0);
     return LinkageLocation(i);
   }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_IMPL_H_