Beware: the dEQP tests here are very weak - they do not seem to properly test the NaN handling of this instruction.

Bug: b/126873455
Tests: dEQP-VK.spirv_assembly.instruction.compute.opnmin.all
Change-Id: I5283af4a1e697b080f53193bc21ddd446b232d1e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28709Reviewed-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>