[SelectionDAG] Teach the vector scalarizer about FP conversions.
This adds support for legalization of instructions of the form:
[fp_conv] <1 x i1> %op to <1 x double>
where fp_conv is one of fpto[us]i, [us]itofp. This used to assert
because they were simply missing from the vector operand scalarizer.
A similar problem arose in r190830, with trunc instead.
Fixes PR20778.
Differential Revision: http://reviews.llvm.org/D5810
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220533
91177308-0d34-0410-b5e6-
96231b3b80d8
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