Update SPIRV-Tools and SPIRV-Headers to latest versions

[jhelferty-nv]

Motivation

Keep Slang's vendored SPIR-V dependencies current so we pick up the latest SPIR-V grammar, extensions, and validator fixes from upstream KhronosGroup. This is the routine SPIRV submodule bump described in docs/update_spirv.md.

Proposed solution

Advance the external/spirv-tools and external/spirv-headers submodules to their latest upstream commits, keeping spirv-headers pinned to exactly the commit spirv-tools/DEPS expects, and regenerate the checked-in files under external/spirv-tools-generated/ so they match what CI produces.

• external/spirv-tools: v2022.4-1263-g12f9d942 -> v2022.4-1284-gf877466a (git describe: v2026.3.rc1-1-gf877466a)
• external/spirv-headers: c63848e -> 29981f6 (matches spirv-tools/DEPS spirv_headers_revision)

build-version.inc was regenerated with --abbrev=8 (via FORCED_BUILD_VERSION_DESCRIPTION) so the git-describe string matches CI's default abbreviation rather than macOS git's.

Change summary

Area	Change
external/spirv-tools	Submodule bumped to f877466a
external/spirv-headers	Submodule bumped to 29981f6 (DEPS-pinned)
external/spirv-tools-generated/build-version.inc	Regenerated (new describe string)
external/spirv-tools-generated/core_tables_body.inc	Regenerated from the new SPIR-V grammar
external/spirv-tools-generated/core_tables_header.inc	Regenerated from the new SPIR-V grammar

No files were added or orphaned; DebugInfo.h, OpenCLDebugInfo100.h, options-pinned.h, and generators.inc were byte-identical after regeneration.

Validation

• bash extras/check-spirv-generated.sh: all 7 generated files match a fresh build, no orphans, and the spirv-headers commit matches spirv-tools/DEPS.
• Clean Release rebuild of Slang succeeded.
• SLANG_RUN_SPIRV_VALIDATION=1 slang-test -use-test-server -server-count 8: 100% passed (7098/7098). GPU-backed Vulkan/D3D/CUDA execution tests were skipped locally (no GPU/Vulkan loader); the static SPIR-V validation across all -target spirv tests plus the CPU/Metal suites ran green. Full GPU coverage is left to CI.

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