Equip float domain to handle definite NaN, +Inf, -Inf, and some missing float stubs #869
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sim642
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In the course of #868 I came across a few tests for sv-comp that are low-hanging fruit that require handling the information that some variable is definitely NaN, +Inf or -Inf. This adds these possibilities.
The resulting lattice is a flat lattice with NaN, +Inf, -Inf, and intervals of actual floats values.
In the course of this PR, I will also add the float stubs sv-comp uses that I identified in #868.