[Ada] Fix crash on very dynamic record types

[Eric Botcazou]

This is a regression present on the mainline and 8 branch: in some specific 
circumstances, you can get a crash when max_size is called from the gimplifier 
on very dynamic record types.  This makes the function a bit more robust.

Tested on x86_64-suse-linux, applied on mainline and 8 branch.


2019-02-08  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/utils.c (max_size) <tcc_unary>: Be prepared for an
	operand with VOID_TYPE.

-- 
Eric Botcazou
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