No impact on compilation with GCC.

Tested on x86_64-pc-linux-gnu, committed on trunk

2019-07-09  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_util.adb (Scope_Within_Or_Same): Handle properly task
	bodies and protected bodies, so that local variables within have
	their proper scopes after these constructs have been rewritten
	during expansion. This patch resembles but is not identical to
	the code in Scope_Within.