Craig Topper 12836467b7 [ConstantRange] Fix off by 1 bugs in UIToFP and SIToFP handling. (#86041) ...

We were passing the min and max values of the range to the ConstantRange
constructor, but the constructor expects the upper bound to 1 more than
the max value so we need to add 1.

We also need to use getNonEmpty so that passing 0, 0 to the constructor
creates a full range rather than an empty range. And passing smin,
smax+1 doesn't cause an assertion.

I believe this fixes at least some of the reason #79158 was reverted.

2024-03-21 09:25:13 -07:00

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