[Patch, fortran] [3/4] C binding access to C_PTR type: don't do name lookup in gen_special_c_interop_ptr

[Mikael Morin]

This patch fixes gen_special_c_interop_ptr, which uses gfc_find_symtree to retrieve
the current symbol.  Again, this is not safe to renaming and hiding, so this
patch passes the symbol directly, instead of passing its name and retrieving
the symbol from it.
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2013-03-02  Mikael Morin  <mikael@gcc.gnu.org>

	* symbol.c (gen_special_c_interop_ptr):  Retrieve symbol through
	argument instead of symbol name lookup.
	(generate_isocbinding_symbol): Update caller.
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