[Ada] Reuse Is_Entry where possible

[Pierre-Marie de Rodat]

Replace a low-level membership test "Ekind_In (Id, E_Entry,
E_Entry_Family)" with a high-level "Is_Entry (Id)", which is more
readable. Semantics stays the same.

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

2020-06-12  Piotr Trojanek  <trojanek@adacore.com>

gcc/ada/

	* contracts.adb, einfo.adb, sem_ch4.adb, sem_ch6.adb,
	sem_res.adb, sem_util.adb: Replace Ekind_In with Is_Entry.
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