Implements the following opcodes:
• OpGroupNonUniformBroadcast
• OpGroupNonUniformBroadcastFirst
• OpGroupNonUniformBallot
• OpGroupNonUniformInverseBallot
• OpGroupNonUniformBallotBitExtract
• OpGroupNonUniformBallotBitCount
• OpGroupNonUniformBallotFindLSB
• OpGroupNonUniformBallotFindMSB

Also don't yield for subgroup scoping - this is pointless, and does not currently work for graphics shaders.

Bug: b/133510501
Tests: dEQP-VK.subgroups.*
Change-Id: I39470bfa9f2184344d1c22e36975db0e23e48cc9
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/35033
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>