[Ada] Spurious warning on iteration over range of 64-bit modular type

[Ada] Spurious warning on iteration over range of 64-bit modular type

This patch suppresses a spurious warning on the use of a 64-bit modular type
in a quantified expression, where the range of iteration will include a bound
that appears larger than the run-time representation of Universal_Integer'last.

2018-07-31  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_eval.adb (Check_Non_Static_Context): Do not warn on an
	integer literal greater than the upper bound of
	Universal_Integer'Last when expansion is disabled, to avoid a
	spurious warning over ranges involving 64-bit modular types.

gcc/testsuite/

	* gnat.dg/iter3.adb: New testcase.

From-SVN: r263095