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spirv: Don't fail if multiple ordering semantics bits are set

Caio Oliveira requested to merge cmarcelo/mesa:r/spirv-multiple-memory-ordering-bits into master

Vulkan requires that only one bit for the ordering is set, but old versions of GLSLang just set all the bits. This was fixed as part of https://github.com/KhronosGroup/glslang/commit/c51287d744fb6e7e9ccc09f6f8451e6c64b1dad6 but we can still find older versions (or their products) around.

So instead of failing, emit a warning and fallback to the effective result of any combination of multiple bits: AcquireRelease.

Closes: #2018 (closed)

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