softmmu: introduce cpu_ldst.h

This will collect all load and store helpers soon.  For now
it is just a replacement for softmmu_exec.h, which this patch
stops including directly, but we also include it where this will
be necessary in order to simplify the next patch.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/target-s390x/fpu_helper.c b/target-s390x/fpu_helper.c
index d879ad6..b946ec1 100644
--- a/target-s390x/fpu_helper.c
+++ b/target-s390x/fpu_helper.c
@@ -19,12 +19,9 @@
  */
 
 #include "cpu.h"
+#include "exec/cpu_ldst.h"
 #include "exec/helper-proto.h"
 
-#if !defined(CONFIG_USER_ONLY)
-#include "exec/softmmu_exec.h"
-#endif
-
 /* #define DEBUG_HELPER */
 #ifdef DEBUG_HELPER
 #define HELPER_LOG(x...) qemu_log(x)