X87: Make concrete classes for individual call descriptors

src/x87/lithium-x87.h

Index: src/x87/lithium-x87.h
diff --git a/src/x87/lithium-x87.h b/src/x87/lithium-x87.h
index 504077bb039c5676e0a06f18bf0dc0b1d24bea21..18c62defaba0905c2cb3541a69d2982430317918 100644
--- a/src/x87/lithium-x87.h
+++ b/src/x87/lithium-x87.h
@@ -1906,10 +1906,10 @@ class LCallJSFunction FINAL : public LTemplateInstruction<1, 1, 0> {
 
 class LCallWithDescriptor FINAL : public LTemplateResultInstruction<1> {
  public:
-  LCallWithDescriptor(const CallInterfaceDescriptor* descriptor,
+  LCallWithDescriptor(CallInterfaceDescriptor descriptor,
                       const ZoneList<LOperand*>& operands, Zone* zone)
-      : inputs_(descriptor->GetRegisterParameterCount() + 1, zone) {
-    DCHECK(descriptor->GetRegisterParameterCount() + 1 == operands.length());
+      : inputs_(descriptor.GetRegisterParameterCount() + 1, zone) {
+    DCHECK(descriptor.GetRegisterParameterCount() + 1 == operands.length());
     inputs_.AddAll(operands, zone);
   }