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efa422023f
- when transforming a vector shift of a non-immediate scalar shift amount, zero
extend the i32 shift amount to i64 since the vector shift reads 64 bits
- when transforming i16 vectors to use a vector shift, zero extend i16 shift amount
- improve the code quality in some cases when transforming vectors to use a vector shift
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80935 91177308-0d34-0410-b5e6-96231b3b80d8
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