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Fix more minor issues from static checkers

From: Jeff Law <law at redhat dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 24 Mar 2011 08:37:55 -0600
Subject: Fix more minor issues from static checkers

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First in tree-ssa-live.c, "ann" is set, but never used in a couple places.

Second, in tree-ssa-copy.c we set "stmt" in
propagate_tree_value_into_stmt, but never use it.  Removing the
assignment is obviously trivial.

Finally, in cfglayout force_nonfallthru may delete its argument (E_FALL)
which we then use.  The fix is to save E_FALL->src prior to the call to
force_nonfallthru.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu.  OK for
trunk?

Thanks,
Jeff
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Follow-Ups:
- Re: Fix more minor issues from static checkers
  - From: Diego Novillo

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