attribute_plugin.c: Include gcc-plugin.h first.

attribute_plugin.c: Include gcc-plugin.h first.

2009-05-27  Rafael Avila de Espindola  <espindola@google.com>

       * g++.dg/plugin/attribute_plugin.c: Include gcc-plugin.h first.
       * g++.dg/plugin/dumb_plugin.c: Include gcc-plugin.h first.
       * g++.dg/plugin/selfassign.c: Include gcc-plugin.h first.
       * gcc.dg/plugin/selfassign.c: Include gcc-plugin.h first.

2009-05-27  Rafael Avila de Espindola  <espindola@google.com>

	* Makefile.in (GCC_PLUGIN_H): New. Replace all uses of gcc-plugin.h with
	it.
	* doc/plugins.texi: Document that gcc-plugin.h must be the first to be
	included.
	* gcc-plugin.h: Include config.h and system.h.
	(IN_GCC): Define if not defined.

From-SVN: r147908