[fullcodegen] Factor out EmitLoadStoreICSlot from archs.

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index e63d3cd07a3be26842423251e5827134a87b0027..bedfdabfda6ac246e936d6d748118a942beb881c 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -3975,11 +3975,6 @@ void FullCodeGenerator::ClearPendingMessage() {
 }
 
 
-void FullCodeGenerator::EmitLoadStoreICSlot(FeedbackVectorSlot slot) {
-  DCHECK(!slot.IsInvalid());
-  __ Move(VectorStoreICTrampolineDescriptor::SlotRegister(), SmiFromSlot(slot));
-}
-
 void FullCodeGenerator::DeferredCommands::EmitCommands() {
   __ Pop(result_register());  // Restore the accumulator.
   __ Pop(rdx);                // Get the token.