Add LLVMIR Dialect counterparts of @llvm.maximum and @llvm.minimum.
These are similar to maxnum and minnum, but they're defined to treat -0
as less than +0. This behavior can't be expressed using float
comparisons and selects, since comparisons are defined to treat
different-signed zeros as equal. So, the only way to communicate this
behavior into LLVM IR without defining target-specific intrinsics is to
add the corresponding ops.
Reviewed By: mehdi_amini
Differential Revision: https://reviews.llvm.org/D96373