ada: Rename Is_Limited_View to reflect actual query

ada: Rename Is_Limited_View to reflect actual query

Function Sem_Aux.Is_Limited_View returns whether the type is
"inherently limited" in a slightly different way from the "immutably
limited" definition in Ada 2012. Rename for clarity.

gcc/ada/

	* exp_aggr.adb: Apply the renaming.
	* exp_ch3.adb: Same.
	* exp_ch4.adb: Same.
	* exp_ch6.adb: Same.
	* exp_ch7.adb: Same.
	* exp_util.adb: Same.
	* freeze.adb: Same.
	* sem_aggr.adb: Same.
	* sem_attr.adb: Same.
	* sem_aux.adb: Alphabetize Is_Limited_Type. Rename.
	* sem_aux.ads: Same.
	* sem_ch3.adb: Apply the renaming.
	* sem_ch6.adb: Same.
	* sem_ch8.adb: Same.
	* sem_prag.adb: Same.
	* sem_res.adb: Same.
	* sem_util.adb: Same.