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Supersedes #311
Refactors the target declaration within
rustc_codegen_spirvto no longer be dependent on thespirv_tools::TargetEnvenum, but a custom representation withinrustc_codegen_spirvitself. The newenum SpirvTargetfirst splits into "types of targets", likeVulkanTarget,UniversalTargetandOpenGLTarget, which can represent arbitrary versions of e.g. Vulkan. This is heavily inspired by @eddyb's feedback in #311 (comment). Also see #484 refactoring spirv-builder's target declaration to not do any target validation, but leave that to the codegen backend aka this PR.This is a prerequisite for adding naga transpilation targets in the followup PR #493. And opens up the path to make the
spirv-toolsdependency optional.