[4.0 PATCH resubmit] Fix PR middle-end/20177

[Mostafa Hagog <MUSTAFA at il dot ibm dot com>]

After this patch was on mainline for several days is it ok to for 4.0
branch?
(following: http://gcc.gnu.org/ml/gcc-patches/2005-03/msg01886.html)
also there are two new test cases.

Here is the patch again with two new test cases.

2005-03-28 Mostafa Hagog <mustafa@il.ibm.com>

      PR middle-end/20177
      * ddg.c (create_ddg_dependence): Ignore reg-anti dependency.
      * modulo-sched.c (const_iteration_count): Return on NULL
      pre-header.
      (print_node_sched_params): Return on NULL dump_file.
      (generate_reg_moves): Handle reg-anti dependencies and disregard
      closing branch when generating register moves.
      (sms_schedule): Mark the SMSed block dirty.
      * passes.c (rest_of_handle_sms): Call update_life_info for all
      basic-blocks.

(See attached file: bootfailtest2.c)(See attached file: 20177_fix9.patch)
(See attached file: 20050321-1.c)

Attachment: bootfailtest2.c
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Attachment: 20177_fix9.patch
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Attachment: 20050321-1.c
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