Spirv builder cleanup#497

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Firestar99 wants to merge 18 commits intomainfrom

spirv_builder_cleanup

Commits on Dec 11, 2025

target-spec: remove crate rustc_codegen_spirv-target-specs
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target-spec: generate target specs on the fly in `spirv-builder`
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target-spec: move `query_rustc_version` to `*spirv-types`
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Commits on Dec 23, 2025