[Ada] Crash on incorrect frontend inlining in GNATprove mode

[Pierre-Marie de Rodat]

In some cases, the inlining performed in GNATprove mode leads to a crash,
when inlining a call where a return statement of the inlined function
returns a string literal. Now fixed.

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

2018-05-21  Yannick Moy  <moy@adacore.com>

gcc/ada/

	* sem_eval.adb (Static_Length): Take into account case of variable of
	subtype string literal.
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