Make concrete classes for individual call descriptors.

src/ic/arm/handler-compiler-arm.cc

Index: src/ic/arm/handler-compiler-arm.cc
diff --git a/src/ic/arm/handler-compiler-arm.cc b/src/ic/arm/handler-compiler-arm.cc
index 9efe9bcfd275e3b3e1f409ec351e1e85622b3eca..71959265277ebc4be0f2815a9dc53a400df77b2c 100644
--- a/src/ic/arm/handler-compiler-arm.cc
+++ b/src/ic/arm/handler-compiler-arm.cc
@@ -291,8 +291,8 @@ void ElementHandlerCompiler::GenerateLoadDictionaryElement(
   // The return address is in lr.
   Label slow, miss;
 
-  Register key = LoadConvention::NameRegister();
-  Register receiver = LoadConvention::ReceiverRegister();
+  Register key = LoadDescriptor::NameRegister();
+  Register receiver = LoadDescriptor::ReceiverRegister();
   DCHECK(receiver.is(r1));
   DCHECK(key.is(r2));
 
@@ -316,8 +316,8 @@ void ElementHandlerCompiler::GenerateLoadDictionaryElement(
 
 void NamedStoreHandlerCompiler::GenerateSlow(MacroAssembler* masm) {
   // Push receiver, key and value for runtime call.
-  __ Push(StoreConvention::ReceiverRegister(), StoreConvention::NameRegister(),
-          StoreConvention::ValueRegister());
+  __ Push(StoreDescriptor::ReceiverRegister(), StoreDescriptor::NameRegister(),
+          StoreDescriptor::ValueRegister());
 
   // The slow case calls into the runtime to complete the store without causing
   // an IC miss that would otherwise cause a transition to the generic stub.
@@ -329,8 +329,8 @@ void NamedStoreHandlerCompiler::GenerateSlow(MacroAssembler* masm) {
 
 void ElementHandlerCompiler::GenerateStoreSlow(MacroAssembler* masm) {
   // Push receiver, key and value for runtime call.
-  __ Push(StoreConvention::ReceiverRegister(), StoreConvention::NameRegister(),
-          StoreConvention::ValueRegister());
+  __ Push(StoreDescriptor::ReceiverRegister(), StoreDescriptor::NameRegister(),
+          StoreDescriptor::ValueRegister());
 
   // The slow case calls into the runtime to complete the store without causing
   // an IC miss that would otherwise cause a transition to the generic stub.
@@ -829,7 +829,7 @@ Handle<Code> NamedStoreHandlerCompiler::CompileStoreInterceptor(
 
 
 Register NamedStoreHandlerCompiler::value() {
-  return StoreConvention::ValueRegister();
+  return StoreDescriptor::ValueRegister();
 }
 
 
@@ -839,7 +839,7 @@ Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
   FrontendHeader(receiver(), name, &miss);
 
   // Get the value from the cell.
-  Register result = StoreConvention::ValueRegister();
+  Register result = StoreDescriptor::ValueRegister();
   __ mov(result, Operand(cell));
   __ ldr(result, FieldMemOperand(result, Cell::kValueOffset));