Implements the following opcodes:
• OpGroupNonUniformShuffle
• OpGroupNonUniformShuffleXor

Bug: b/133510501
Tests: dEQP-VK.subgroups.*
Change-Id: I85dcfebe3d56d7c5a73b7fdbcb88885e7e228747
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/35089
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>