tcg: Pass TCGHelperInfo to tcg_gen_callN

In preparation for compiling tcg/ only once, eliminate
the all_helpers array.  Instantiate the info structs for
the generic helpers in accel/tcg/, and the structs for
the target-specific helpers in each translate.c.

Since we don't see all of the info structs at startup,
initialize at first use, using g_once_init_* to make
sure we don't race while doing so.

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/rx/translate.c

@@ -28,6 +28,11 @@
 #include "exec/translator.h"
 #include "exec/log.h"
 
+#define HELPER_H "helper.h"
+#include "exec/helper-info.c.inc"
+#undef  HELPER_H
+
+
 typedef struct DisasContext {
     DisasContextBase base;
     CPURXState *env;