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/linux-user/qemu.h b/linux-user/qemu.h
index 36d4a73..ba3d8ab 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -5,6 +5,7 @@
 #include <string.h>
 
 #include "cpu.h"
+#include "exec/cpu_ldst.h"
 
 #undef DEBUG_REMAP
 #ifdef DEBUG_REMAP