CL/Vulkan: Add support for LiteralSampler The support for LiteralSampler in clspv is enabled through the SPIR-V non-sementic clspv reflection instructions - LiteralSampler [1]. Setting the utility functions to process these instructions. Bug: angleproject:394767574 Change-Id: I47aa03dac050f723d2e3f2a7f9c6c1756e7ac9cf Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6239519 Commit-Queue: Austin Annestrand <a.annestrand@samsung.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Austin Annestrand <a.annestrand@samsung.com>