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[dataflow]: PATCH: fix grammar error, clean whitespace, add more comments

This is mostly more comments and fixes for grammar/spelling erorrs
and whitespace cleanup. Bootstrapped and reg-tested on i686.
OK?

2007-01-10  Seongbae Park <seongbae.park@gmail.com>
       * df-core.c (df_worklist_propagate_backward,
       df_worklist_dataflow)): More comments.
       (df_iterative_dataflow): Whitespace fixup.
       * cfganal.c (inverted_post_order_compute):
       More comments and rename a local variable DEST to PRED.
       (df_find_deadend): More comments. Use gcc_unreachable().

--
#pragma ident "Seongbae Park, compiler, http://seongbae.blogspot.com";

Attachment: df-r79-comments.diff.txt
Description: Text document

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