target-ppc: retain l{w,d}arx loaded value

We do this so we can check on the corresponding stc{w,d}x. whether the
value has changed.  It's a poor man's form of implementing atomic
operations and is valid only for NPTL usermode Linux emulation.

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: malc <av1474@comtv.ru>
diff --git a/target-ppc/machine.c b/target-ppc/machine.c
index 99ba3eb..deb2e2d 100644
--- a/target-ppc/machine.c
+++ b/target-ppc/machine.c
@@ -20,7 +20,7 @@
     for (i = 0; i < 8; i++)
         qemu_put_be32s(f, &env->crf[i]);
     qemu_put_betls(f, &env->xer);
-    qemu_put_betls(f, &env->reserve);
+    qemu_put_betls(f, &env->reserve_addr);
     qemu_put_betls(f, &env->msr);
     for (i = 0; i < 4; i++)
         qemu_put_betls(f, &env->tgpr[i]);
@@ -107,7 +107,7 @@
     for (i = 0; i < 8; i++)
         qemu_get_be32s(f, &env->crf[i]);
     qemu_get_betls(f, &env->xer);
-    qemu_get_betls(f, &env->reserve);
+    qemu_get_betls(f, &env->reserve_addr);
     qemu_get_betls(f, &env->msr);
     for (i = 0; i < 4; i++)
         qemu_get_betls(f, &env->tgpr[i]);