Use IC register definitions in platform files.

src/arm64/lithium-arm64.cc

Index: src/arm64/lithium-arm64.cc
diff --git a/src/arm64/lithium-arm64.cc b/src/arm64/lithium-arm64.cc
index 2af833b4ec46ab1988d5ad71ecb13631ac795aaf..a5d59be6f1ca576877feafb811d924eb8d0fb1ab 100644
--- a/src/arm64/lithium-arm64.cc
+++ b/src/arm64/lithium-arm64.cc
@@ -1658,7 +1658,8 @@ LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
 
 LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* global_object = UseFixed(instr->global_object(), x0);
+  LOperand* global_object = UseFixed(instr->global_object(),
+                                     LoadIC::ReceiverRegister());
   LLoadGlobalGeneric* result =
       new(zone()) LLoadGlobalGeneric(context, global_object);
   return MarkAsCall(DefineFixed(result, x0), instr);
@@ -1714,8 +1715,8 @@ LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
 
 LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseFixed(instr->object(), x1);
-  LOperand* key = UseFixed(instr->key(), x0);
+  LOperand* object = UseFixed(instr->object(), KeyedLoadIC::ReceiverRegister());
+  LOperand* key = UseFixed(instr->key(), KeyedLoadIC::NameRegister());
 
   LInstruction* result =
       DefineFixed(new(zone()) LLoadKeyedGeneric(context, object, key), x0);
@@ -1731,7 +1732,7 @@ LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
 
 LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseFixed(instr->object(), x0);
+  LOperand* object = UseFixed(instr->object(), LoadIC::ReceiverRegister());
   LInstruction* result =
       DefineFixed(new(zone()) LLoadNamedGeneric(context, object), x0);
   return MarkAsCall(result, instr);