[Ada] Improve generated code for initialization of atomics

[Pierre-Marie de Rodat]

This patch makes the temp for initialization of an atomic variable be
constant.

No change in behavior; no test.

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

2019-08-20  Bob Duff  <duff@adacore.com>

gcc/ada/

	* freeze.adb (Is_Atomic_VFA_Aggregate): Make the temp for
	initialization of the atomic variable be constant. This is
	cleaner, and might improve efficiency.
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