[Ada] Hang on cond expression as actual for anonymous access formal

[Pierre-Marie de Rodat]

This patch fixes a bug in the compiler whereby a conditional expression
used as an actual for an anonymous access formal when the condition is
known at compile time.

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

gcc/ada/

	* exp_ch6.adb (Expand_Call_Helper): Properly handle the case
	where the condition of a conditional expression has been
	optimized out when calculating the value of an extra
	accessibility parameter.
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