[InstCombine] fold FP trunc into exact itofp
Similar to D79116 and rGbfd512160fe0 - if the 1st cast is exact, then we can go directly to the destination type because there is no double-rounding.
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Similar to D79116 and rGbfd512160fe0 - if the 1st cast is exact, then we can go directly to the destination type because there is no double-rounding.