ppc: Move load and store helpers, switch to AREG0 free mode

Add an explicit CPUPPCState parameter instead of relying on AREG0
and rename op_helper.c (which only contains load and store helpers)
to mem_helper.c. Remove AREG0 swapping in
tlb_fill().

Switch to AREG0 free mode. Use cpu_ld{l,uw}_code in translation
and interrupt handling, cpu_{ld,st}{l,uw}_data in loads and stores.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/target-ppc/Makefile.objs b/target-ppc/Makefile.objs
index 8d4d16b..6c11ef8 100644
--- a/target-ppc/Makefile.objs
+++ b/target-ppc/Makefile.objs
@@ -1,12 +1,11 @@
-obj-y += translate.o op_helper.o helper.o
+obj-y += translate.o helper.o
 obj-$(CONFIG_SOFTMMU) += machine.o
 obj-$(CONFIG_KVM) += kvm.o kvm_ppc.o
-obj-y += op_helper.o helper.o
+obj-y += helper.o
 obj-y += excp_helper.o
 obj-y += fpu_helper.o
 obj-y += int_helper.o
 obj-y += mmu_helper.o
 obj-y += timebase_helper.o
 obj-y += misc_helper.o
-
-$(obj)/op_helper.o: QEMU_CFLAGS += $(HELPER_CFLAGS)
+obj-y += mem_helper.o