KeyedLoadIC should have same register spec as LoadIC.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index c1022fbc17de46d9cc8c897ad4eacb9cad9f7408..b9de0488bbca299cfda57ac3a75e237af3f69abe 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2194,8 +2194,8 @@ LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
 
 LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), rsi);
-  LOperand* object = UseFixed(instr->object(), KeyedLoadIC::ReceiverRegister());
-  LOperand* key = UseFixed(instr->key(), KeyedLoadIC::NameRegister());
+  LOperand* object = UseFixed(instr->object(), LoadIC::ReceiverRegister());
+  LOperand* key = UseFixed(instr->key(), LoadIC::NameRegister());
 
   LLoadKeyedGeneric* result =
       new(zone()) LLoadKeyedGeneric(context, object, key);