[APFloat] prevent NaN morphing into Inf on conversion (PR43907)
We shift the significand right on a truncation, but that needs to be made NaN-safe: always set at least 1 bit in the significand. https://llvm.org/PR43907 See D88238 for the likely follow-up (but needs some plumbing fixes before it can proceed). Differential Revision: https://reviews.llvm.org/D87835 (cherry picked from commit e34bd1e0)
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