[Ada] Fix interfacing with C++ methods on 32-bit Windows

[Eric Botcazou]

Gigi fails to set the "thiscall" calling convention on a method imported from 
C++ if the class has no virtual member functions on the C++ side.

Tested on x86-windows, applied on the mainline.


2015-02-08  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (is_cplusplus_method): Use Is_Primitive flag to
	detect primitive operations of tagged and untagged types.


-- 
Eric Botcazou
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