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from dda50f2 Next set of additional error checks for invalid Mach-O files [...] new 6642664 Wisely choose sext or zext when widening IV.

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Summary of changes: lib/Transforms/Scalar/IndVarSimplify.cpp | 125 +++++++--- .../Transforms/IndVarSimplify/iv-widen-elim-ext.ll | 270 +++++++++++++++++++++ 2 files changed, 358 insertions(+), 37 deletions(-) create mode 100644 test/Transforms/IndVarSimplify/iv-widen-elim-ext.ll