[DAGTypeLegalizer] Handle SIGN/ZERO_EXTEND in WidenVecRes_Convert().
In case of a SIGN/ZERO_EXTEND of an incomplete vector type (using only a
partial number of available vector elements), WidenVecRes_Convert() used to
resort to scalarization.
This patch adds a handling of the (common) case where an input vector can be
found of same width as the widened result vector, by converting the node to
SIGN/ZERO_EXTEND_VECTOR_INREG.
Review: Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293268
91177308-0d34-0410-b5e6-
96231b3b80d8
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