Dan Gohman d632f89596 Make LSR's OptimizeShadowIV ignore induction variables with negative ...

strides for now, because it doesn't handle them correctly. This fixes a
miscompile of SingleSource/Benchmarks/Misc-C++/ray.

This problem was usually hidden because indvars transforms such induction
variables into negations of canonical induction variables.

llvm-svn: 85118

2009-10-26 15:32:57 +00:00

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