re PR debug/41888 (ICE from '-O -ftree-loop-distribution -fgraphite-identity -g')

re PR debug/41888 (ICE from '-O -ftree-loop-distribution -fgraphite-identity -g')

PR debug/41888
PR debug/41886
* graphite-scop-detection.c (stmt_simple_for_scop_p): Debug stmts
are ok.
* graphite-sese-to-poly.c (graphite_stmt_p): Likewise.
(try_generate_gimple_bb): Skip debug stmts when finding data refs.
* sese.c (sese_build_liveouts_bb): Skip debug stmts.
(sese_bad_liveouts_use): New.
(sese_reset_debug_liveouts_bb): New.
(sese_build_liveouts): Use it.
(rename_variables_in_stmt): Reset debug stmts rather than creating
new vars for them.
(expand_scalar_variable_stmt): Likewise.

From-SVN: r154279