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[lno-branch]: Add support for invariants as bounds, and simple linear offsets

From: Daniel Berlin <dberlin at dberlin dot org>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Fri, 23 Apr 2004 09:15:28 -0400
Subject: [lno-branch]: Add support for invariants as bounds, and simple linear offsets

Needed to handle the loops we now get when canonicalize finishes, as well as most loops found in benchmarks/real programs.

Hopefully i'll be able to get rid of most of the ugly code in gcc_loop_to_lambda_loop soon, in favor of just always using the scalar evolution stuff.

bootstrapped on powerpc-darwin

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