objc-act.c (objc_eh_personality): Select personality name on runtime.

gcc/objc:

	* objc/objc-act.c (objc_eh_personality): Select personality name on
	runtime.
	(objc_init_exceptions): New.
	(objc_begin_try_stmt): Use objc_init_exceptions.
	(objc_build_throw_stmt): Likewise.

gcc/testsuite:

	* fobjc-exceptions.m: Update dg-error syntax.

From-SVN: r168020