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Commit ec39eb85 authored by Torok Edwin's avatar Torok Edwin
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APInt's countLeadingOnes() was broken for negative i128 values, 

causing assertion failures in getSExtValue().
Fix it by making highWordBits actually contain what its name says,
and add some more unit-tests for APInt.
This fixes PR3419.

llvm-svn: 63107
parent ed2ba0fb
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