[Ada] Use C++-compatible calling convention on x86/Windows

[Eric Botcazou]

This changes the calling convention of primitive operations on x86/Windows (the 
equivalent of C++ methods) in order to be compatible with C++, which changed 
the calling convention in order to be compatible with MSVC++.

Tested on i686-pc-mingw32, applied on the mainline and 4.7 branch.


2012-05-19  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (Has_Thiscall_Convention): New macro.
	(gnat_to_gnu_entity) <E_Subprogram_Type>: Test it to set the thiscall
	calling convention
	(get_minimal_subprog_decl): Likewise.
	(gnat_first_param_is_class): New predicate.


-- 
Eric Botcazou
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