[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..b2ebecd62f64ba793bffda6a6ec15e6f3c6ccc8c 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -241,8 +241,11 @@ 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);
+  //
+  // If |does_return| is true, then this bytecode will return from the current
+  // function rather than dispatching to a new bytecode.
+  static CallDescriptor* GetInterpreterDispatchDescriptor(Zone* zone,
+                                                          bool will_return);
 
   // Get the location of an (incoming) parameter to this function.
   LinkageLocation GetParameterLocation(int index) const {