fix codegen error exposed by compute isl flow patch

fix codegen error exposed by compute isl flow patch

we used to fail using an iv from a different loop.

	* graphite-isl-ast-to-gimple.c (enum phi_node_kind): New.
	(class translate_isl_ast_to_gimple): Use phi_node_kind instead of bool.
	(is_valid_rename): Same.
	(translate_isl_ast_to_gimple::get_rename): Same.
	(translate_isl_ast_to_gimple::rename_all_uses): Same.
	(translate_isl_ast_to_gimple::rename_uses): Same.
	(get_new_name): Check for close_phi nodes.
	(copy_loop_phi_args): Use phi_node_kind.
	(translate_isl_ast_to_gimple::copy_loop_close_phi_args): Same.
	(translate_isl_ast_to_gimple::copy_cond_phi_args): Same.

gcc/testsuite

	* gfortran.dg/graphite/interchange-3.f90: Adjust pattern.

Co-Authored-By: Sebastian Pop <s.pop@samsung.com>
From-SVN: r232660