Fix #22489 - e - e is not 0 with NaNs

[limepoutine]

Don't remove e - e for floating point types.

[thewilsonator]

This should check that real is 80-bit and not 64-bit and version accordingly, but otherwise looks good

[limepoutine]

Mind me taking a simpler test case in #22489 (comment)? Handling every real size properly would require much more code.

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[limepoutine]

OK, found an elegant way to test this. Also affects vector types.