[Ada] Spurious error on address clause in task body

[Ada] Spurious error on address clause in task body

2020-06-05  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_ch9.adb, (Analyze_Task_Body): After analying the task
	body, indicate that all local variables have no delayed aspects.
	This prevents improper later calls to
	Check_Aspect_At_End_Of_Declarations, that would happen when the
	constructed task_procedure body (generated during expansion) is
	analyzed. The legality of aspect specifications that may appear
	on local declarations has already been established, and it is in
	general not possible to recheck them properly during expansion,
	when visibility may not be fully established.