Add system_info(atom_limit)

Add system_info(atom_limit) to provide a way to retrieve the maximum
number of atoms allowed. Add tests and documentation for it too.

Also split system_info_SUITE:start_node/2 to start_node_ets/2 and
start_node_atm/2 to avoid code duplication.

1 files changed, 6 insertions, 0 deletions

diff --git a/erts/emulator/beam/atom.c b/erts/emulator/beam/atom.c
index a5e778e4aa..d2fad24805 100644
--- a/erts/emulator/beam/atom.c
+++ b/erts/emulator/beam/atom.c
@@ -483,3 +483,9 @@ dump_atoms(int to, void *to_arg)
 	}
     }
 }
+
+Uint
+erts_get_atom_limit(void)
+{
+    return erts_atom_table.limit;
+}
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