re PR tree-optimization/67284 (libgo fails to build on trunk r227015 / *-linux-gnu)

	PR tree-optimization/67284
	* go-gcc.cc (Gcc_backend::define_builtin): Add NORETURN_P parameter.
	Set TREE_THIS_VOLATILE.
	(Gcc_backend::Gcc_backend): Mark __builtin_trap as a noreturn call.
	Pass false to the rest of define_builtin calls.

From-SVN: r227134

gcc/go/ChangeLog

+2015-08-24  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/67284
+	* go-gcc.cc (Gcc_backend::define_builtin): Add NORETURN_P parameter.
+	Set TREE_THIS_VOLATILE.
+	(Gcc_backend::Gcc_backend): Mark __builtin_trap as a noreturn call.
+	Pass false to the rest of define_builtin calls.
+
 2015-07-31  Andreas Schwab  <schwab@linux-m68k.org>
 
 	* go-lang.c (go_langhook_init_options_struct): Don't set