Preview of a first step towards unification of hydrogen calls

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 7ba30883c755bc358709d68e2f59a73a9864616b..c7cb403cc3a23ddc449194a757ad8d09f0713217 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1078,6 +1078,15 @@ class Isolate {
   CodeStubInterfaceDescriptor*
       code_stub_interface_descriptor(int index);
 
+  enum CallDescriptorKey {
+    KeyedCall,
+    NamedCall,
+    ArgumentAdaptorCall,
+    NUMBER_OF_CALL_DESCRIPTORS
+  };
+
+  CodeStubInterfaceDescriptor* call_descriptor(CallDescriptorKey index);
+
   void IterateDeferredHandles(ObjectVisitor* visitor);
   void LinkDeferredHandles(DeferredHandles* deferred_handles);
   void UnlinkDeferredHandles(DeferredHandles* deferred_handles);
@@ -1300,6 +1309,7 @@ class Isolate {
   DateCache* date_cache_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
   CodeStubInterfaceDescriptor* code_stub_interface_descriptors_;
+  CodeStubInterfaceDescriptor* call_descriptors_;
   RandomNumberGenerator* random_number_generator_;
 
   // True if fatal error has been signaled for this isolate.