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[mlir]][SPIRV] Define OrderedOp and UnorderedOp and add lowerings from Standard.

Authored by mravishankar on Jan 20 2021, 2:47 PM.

Description

[mlir]][SPIRV] Define OrderedOp and UnorderedOp and add lowerings from Standard.

Define OrderedOp and UnorderedOp instructions in SPIR-V and convert
cmpf operations with ord and uno tag to these instructions
respectively.

Differential Revision: https://reviews.llvm.org/D95098