Sanjay Patel ede3982792 [SDAG] allow more cast folding for vector sext-of-setcc
This is a follow-up to D103280 that eases the use restrictions,
so we can handle the motivating case from:
https://llvm.org/PR50055

The loop code is adapted from similar use checks in
ExtendUsesToFormExtLoad() and SliceUpLoad(). I did not see an
easier way to filter out non-chain uses of load values.

Differential Revision: https://reviews.llvm.org/D103462
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