Add opt.stats_print_opts.

The value is passed to atexit(3)-triggered malloc_stats_print() calls.

include/jemalloc/internal/stats.h

@@ -7,8 +7,27 @@
 #include "jemalloc/internal/size_classes.h"
 #include "jemalloc/internal/stats_tsd.h"
 
-/* The opt.stats_print storage. */
+/*  OPTION(opt,		var_name,	default,	set_value_to) */
+#define STATS_PRINT_OPTIONS						\
+    OPTION('J',		json,		false,		true)		\
+    OPTION('g',		general,	true,		false)		\
+    OPTION('m',		merged,		config_stats,	false)		\
+    OPTION('d',		destroyed,	config_stats,	false)		\
+    OPTION('a',		unmerged,	config_stats,	false)		\
+    OPTION('b',		bins,		true,		false)		\
+    OPTION('l',		large,		true,		false)		\
+    OPTION('x',		mutex,		true,		false)
+
+enum {
+#define OPTION(o, v, d, s) stats_print_option_num_##v,
+    STATS_PRINT_OPTIONS
+#undef OPTION
+    stats_print_tot_num_options
+};
+
+/* Options for stats_print. */
 extern bool opt_stats_print;
+extern char opt_stats_print_opts[stats_print_tot_num_options+1];
 
 /* Implements je_malloc_stats_print. */
 void stats_print(void (*write_cb)(void *, const char *), void *cbopaque,