m4: optimize.

* data/bison.m4, data/java.m4, data/variant.hh: m4_map_args is reported
to be faster than m4_map.

data/bison.m4

diff --git a/data/bison.m4 b/data/bison.m4
index 1ec1799..bffd8b5 100644
--- a/data/bison.m4
+++ b/data/bison.m4
@@ -463,7 +463,7 @@
 # Skip NUMS that have no type-name.
 m4_define([b4_type_action_],
 [b4_symbol_if([$1], [has_type],
-[m4_map([b4_symbol_case_], [$@])[]dnl
+[m4_map_args([b4_symbol_case_], $@)[]dnl
         b4_dollar_dollar([b4_symbol([$1], [number])],
                          [b4_symbol([$1], [tag])],
                          [b4_symbol([$1], [type])]);

data/java.m4

diff --git a/data/java.m4 b/data/java.m4
index cd70852..a671c19 100644
--- a/data/java.m4
+++ b/data/java.m4
@@ -260,7 +260,7 @@
           [$1])])
 
 m4_define([b4_param_decls],
-          [m4_map([b4_param_decl], [$@])])
+          [m4_map_args([b4_param_decl], $@)])
 m4_define([b4_param_decl], [, $1])
 
 m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
@@ -287,7 +287,7 @@
                                      b4_param_calls(b4_lex_param))],
                     [$1])])
 m4_define([b4_param_calls],
-          [m4_map([b4_param_call], [$@])])
+          [m4_map_args([b4_param_call], $@)])
 m4_define([b4_param_call], [, $2])
 
 
@@ -300,7 +300,7 @@
                     [b4_constructor_calls(b4_parse_param)])])
 
 m4_define([b4_constructor_calls],
-          [m4_map([b4_constructor_call], [$@])])
+          [m4_map_args([b4_constructor_call], $@)])
 m4_define([b4_constructor_call],
           [this.$2 = $2;
           ])

data/variant.hh

diff --git a/data/variant.hh b/data/variant.hh
index 5895b29..2297bf1 100644
--- a/data/variant.hh
+++ b/data/variant.hh
@@ -69,7 +69,7 @@
 m4_define([b4_char_sizeof],
 [b4_symbol_if([$1], [has_type],
 [
-m4_map([b4_char_sizeof_], [$@])dnl
+m4_map_args([b4_char_sizeof_], $@)dnl
       char _b4_char_sizeof_dummy@{sizeof([b4_symbol([$1], [type])])@};
 ])])