Const-corrected some MachineSignature* parameters.

src/compiler/linkage.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_H_
 #define V8_COMPILER_LINKAGE_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/machine-type.h"
@@ skipping 46 matching lines @@
     // TODO(jarin) kLazyDeoptimization and kNeedsFrameState should be unified.
     kNoFlags = 0u,
     kNeedsFrameState = 1u << 0,
     kPatchableCallSite = 1u << 1,
     kNeedsNopAfterCall = 1u << 2,
     kPatchableCallSiteWithNop = kPatchableCallSite | kNeedsNopAfterCall
   };
   typedef base::Flags<Flag> Flags;
 
   CallDescriptor(Kind kind, MachineType target_type, LinkageLocation target_loc,
-                 MachineSignature* machine_sig, LocationSignature* location_sig,
-                 size_t js_param_count, Operator::Properties properties,
+                 const MachineSignature* machine_sig,
+                 LocationSignature* location_sig, size_t js_param_count,
+                 Operator::Properties properties,
                  RegList callee_saved_registers, Flags flags,
                  const char* debug_name = "")
       : kind_(kind),
         target_type_(target_type),
         target_loc_(target_loc),
         machine_sig_(machine_sig),
         location_sig_(location_sig),
         js_param_count_(js_param_count),
         properties_(properties),
         callee_saved_registers_(callee_saved_registers),
@@ skipping 123 matching lines @@
   static CallDescriptor* GetStubCallDescriptor(
       Isolate* isolate, Zone* zone, const CallInterfaceDescriptor& descriptor,
       int stack_parameter_count, CallDescriptor::Flags flags,
       Operator::Properties properties);
 
   // Creates a call descriptor for simplified C calls that is appropriate
   // for the host platform. This simplified calling convention only supports
   // integers and pointers of one word size each, i.e. no floating point,
   // structs, pointers to members, etc.
   static CallDescriptor* GetSimplifiedCDescriptor(Zone* zone,
-                                                  MachineSignature* sig);
+                                                  const MachineSignature* sig);
 
   // Get the location of an (incoming) parameter to this function.
   LinkageLocation GetParameterLocation(int index) const {
     return incoming_->GetInputLocation(index + 1);  // + 1 to skip target.
   }
 
   // Get the machine type of an (incoming) parameter to this function.
   MachineType GetParameterType(int index) const {
     return incoming_->GetInputType(index + 1);  // + 1 to skip target.
   }
@@ skipping 27 matching lines @@
   CallDescriptor* const incoming_;
 
   DISALLOW_COPY_AND_ASSIGN(Linkage);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_H_