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PR debug/36617 * tree-cfg.c (struct move_stmt_d): Replace block field with orig_block and new_block fields. (move_stmt_r): Only set TREE_BLOCK to p->new_block if if it used to be NULL, p->orig_block or if p->orig_block is NULL. (move_block_to_fn): Replace vars_map and new_label_map arguments with struct move_stmt_d pointer. (replace_block_vars_by_duplicates): New function. (move_sese_region_to_fn): Add ORIG_BLOCK argument. Adjust move_block_to_fn caller. If ORIG_BLOCK is non-NULL, move over all subblocks of ORIG_BLOCK to the new function. Call replace_block_vars_by_duplicates. * tree-flow.h (move_sese_region_to_fn): Adjust prototype. * omp-low.c (expand_omp_taskreg): Set TREE_USED on DECL_INITIAL BLOCK of the new function. Adjust move_sese_region_to_fn caller. Prune vars with original DECL_CONTEXT from child_cfun->local_decls. (expand_omp): Temporarily set input_location to the location of region's controlling stmt. (lower_omp_sections, lower_omp_for): Add a BLOCK into outermost BIND_EXPR, push ctx->block_vars and gimplification vars into the BIND_EXPR and its block's BLOCK_VARS instead of directly into dest function. (lower_omp_single): Set TREE_USED on the BIND_EXPR's BLOCK if there are any BLOCK_VARS. (lower_omp_taskreg): Set BLOCK on a BIND_EXPR containing the OMP_PARALLEL or OMP_TASK stmt. (lower_omp): Save and restore input_location around the lower_omp_1 call. * testsuite/libgomp.c/debug-1.c: New test. From-SVN: r137198