[Ada] Fix scope computation for entry bodies and accept alternatives

[Ada] Fix scope computation for entry bodies and accept alternatives

2018-08-21  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* exp_ch9.adb (Reset_Scopes): Do not recurse into type
	declarations when resetting the scope of entities declared the
	procedures generated for entry bodies and accept alternatives.
	Use the entity of the procedure declaration, not its body, as
	the new scope.

From-SVN: r263713