[PATCH] - Improve widening of 3 element binary vector operations that don't trap

[Redmond, Paul]

This patch improves the widening of non-div/rem binary vector operations

- split WidenVecRes_Binary into WidenVecRes_Binary and
WidenVecRes_BinaryCanTrap
  - WidenVecRes_BinaryCanTrap preserves the original behaviour for
operations that can trap
  - WidenVecRes_Binary simply widens the operation and improves codegen
for 3 element vectors
    by allowing widening and promotion on x86 (matches the behaviour of
unary and ternary
    operation widening)

Thanks
paul

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