X87: [compiler] Drop the CompareNilIC.

src/x87/interface-descriptors-x87.cc

Index: src/x87/interface-descriptors-x87.cc
diff --git a/src/x87/interface-descriptors-x87.cc b/src/x87/interface-descriptors-x87.cc
index bfed342eb8c951f42696a4263e4fdc40ca47738a..5cf27ac7f3b8179f36395a198ded6f57cedba380 100644
--- a/src/x87/interface-descriptors-x87.cc
+++ b/src/x87/interface-descriptors-x87.cc
@@ -321,13 +321,6 @@ void CompareDescriptor::InitializePlatformSpecific(
 }
 
 
-void CompareNilDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {eax};
-  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
-}
-
-
 void ToBooleanDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {eax};