Make concrete classes for individual call descriptors.

src/ia32/builtins-ia32.cc

Index: src/ia32/builtins-ia32.cc
diff --git a/src/ia32/builtins-ia32.cc b/src/ia32/builtins-ia32.cc
index 5980049a11ce2f6032f0d38ba962c6195639d478..497159501c924fdd75441c177d493849be0f2b29 100644
--- a/src/ia32/builtins-ia32.cc
+++ b/src/ia32/builtins-ia32.cc
@@ -994,8 +994,8 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
 
     // Copy all arguments from the array to the stack.
     Label entry, loop;
-    Register receiver = LoadConvention::ReceiverRegister();
-    Register key = LoadConvention::NameRegister();
+    Register receiver = LoadDescriptor::ReceiverRegister();
+    Register key = LoadDescriptor::NameRegister();
     __ mov(key, Operand(ebp, kIndexOffset));
     __ jmp(&entry);
     __ bind(&loop);
@@ -1003,7 +1003,8 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
 
     // Use inline caching to speed up access to arguments.
     if (FLAG_vector_ics) {
-      __ mov(VectorLoadConvention::SlotRegister(), Immediate(Smi::FromInt(0)));
+      __ mov(VectorLoadICDescriptor::SlotRegister(),
+             Immediate(Smi::FromInt(0)));
     }
     Handle<Code> ic = masm->isolate()->builtins()->KeyedLoadIC_Initialize();
     __ call(ic, RelocInfo::CODE_TARGET);