spirv: Initial SPIR-V 1.4 support
This MR contains the header updates and the simple changes in SPIR-V 1.4.
Other MRs will have the larger changes introduced by the new version.
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Our infrastructure migration is complete. Please remember to update your SSH remote to point to ssh.gitlab.freedesktop.org; SSH to the old hostname will time out. You should not see any problems apart from that. Please let us know if you do have any other issues.
This MR contains the header updates and the simple changes in SPIR-V 1.4.
Other MRs will have the larger changes introduced by the new version.