Make concrete classes for individual call descriptors.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 43ba6c6ebea78e7dd79def0e1642f3ed64dc9520..f3030a98cde46a7877bbe32589cf1d67056164f5 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -33,7 +33,7 @@ class RandomNumberGenerator;
 namespace internal {
 
 class Bootstrapper;
-class CallInterfaceDescriptor;
+class CallInterfaceDescriptorData;
 class CodeGenerator;
 class CodeRange;
 class CodeStubInterfaceDescriptor;
@@ -1037,7 +1037,7 @@ class Isolate {
   CodeStubInterfaceDescriptor*
       code_stub_interface_descriptor(int index);
 
-  CallInterfaceDescriptor* call_descriptor(int index);
+  CallInterfaceDescriptorData* call_descriptor_data(int index);
 
   void IterateDeferredHandles(ObjectVisitor* visitor);
   void LinkDeferredHandles(DeferredHandles* deferred_handles);
@@ -1274,7 +1274,7 @@ class Isolate {
   DateCache* date_cache_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
   CodeStubInterfaceDescriptor* code_stub_interface_descriptors_;
-  CallInterfaceDescriptor* call_descriptors_;
+  CallInterfaceDescriptorData* call_descriptor_data_;
   base::RandomNumberGenerator* random_number_generator_;
 
   // Whether the isolate has been created for snapshotting.