[interpreter] Add basic framework for bytecode handler code generation.

src/compiler/linkage.h

Index: src/compiler/linkage.h
diff --git a/src/compiler/linkage.h b/src/compiler/linkage.h
index 45d15c9eead52a5cdc709f20b4c19fc4261accbf..ea20b655ca2f1f08e3331cdc9b480eb311648503 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -241,8 +241,7 @@ class Linkage : public ZoneObject {
   // Creates a call descriptor for interpreter handler code stubs. These are not
   // intended to be called directly but are instead dispatched to by the
   // interpreter.
-  static CallDescriptor* GetInterpreterDispatchDescriptor(
-      Zone* zone, const MachineSignature* sig);
+  static CallDescriptor* GetInterpreterDispatchDescriptor(Zone* zone);
 
   // Get the location of an (incoming) parameter to this function.
   LinkageLocation GetParameterLocation(int index) const {
@@ -280,6 +279,11 @@ class Linkage : public ZoneObject {
   // A special {OsrValue} index to indicate the context spill slot.
   static const int kOsrContextSpillSlotIndex = -1;
 
+  // Special parameter indices used to pass fixed register data through
+  // interpreter dispatches.
+  static const int kInterpreterBytecodeParameter = 0;
+  static const int kInterpreterDispatchTableParameter = 1;
+
  private:
   CallDescriptor* const incoming_;