Fix PR ada/62019

[Eric Botcazou]

Someone broke again weak external symbols in Ada in exactly the same way as:
  https://gcc.gnu.org/ml/gcc-patches/2014-01/msg00431.html
probably during the ongoing C++ reshuffling:

FAIL: gnat.dg/weak2.adb (test for excess errors)

Tested on x86_64-suse-linux, applied on the mainline as obvious.


2014-10-14  Eric Botcazou  <ebotcazou@adacore.com>

	PR ada/62019
	* tree-eh.c (tree_could_trap) <FUNCTION_DECL>: Revamp and really
	do not choke on null node.
	<VAR_DECL>: Likewise.


-- 
Eric Botcazou
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