be: Do not explicitly set $default_attr_type.

The generator chooses the right default automatically.

ir/be/TEMPLATE/TEMPLATE_spec.pl

@@ -70,8 +70,6 @@ $mode_fp = "mode_F";  # mode used by floatingpoint registers
 	]
 );
 
-$default_attr_type = "TEMPLATE_attr_t";
-
 my $binop = {
 	irn_flags => [ "rematerializable" ],
 	in_reqs   => [ "gp", "gp" ],

ir/be/arm/arm_spec.pl

@@ -44,8 +44,6 @@ $mode_fp    = "mode_F";
 	],
 );
 
-$default_attr_type = "arm_attr_t";
-
 %init_attr = (
 	arm_attr_t =>
 		"init_arm_attributes(res, irn_flags, in_reqs, n_res);",

ir/be/ia32/ia32_spec.pl

@@ -66,8 +66,6 @@ $mode_fpcw  = "ia32_mode_fpcw";
 	],
 );
 
-$default_attr_type = "ia32_attr_t";
-
 sub ia32_custom_init_attr {
 	my ($constr, $node, $name) = @_;
 

ir/be/sparc/sparc_spec.pl

@@ -98,8 +98,6 @@ $mode_fp4     = "sparc_mode_Q";
 	]
 );
 
-$default_attr_type = "sparc_attr_t";
-
 %init_attr = (
 	sparc_attr_t            => "be_info_init_irn(res, irn_flags, in_reqs, n_res);",
 	sparc_load_store_attr_t => "be_info_init_irn(res, irn_flags, in_reqs, n_res);",