tree bb9eef7e8691c6a2a0de35b5e4d5997fff45e31a
parent 6a73711e50ef07ee0fbf519516e132cfdb62c6b7
author maxbartel <bartel@roofline.ai> 1764260722 +0100
committer GitHub <noreply@github.com> 1764260722 -0500
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[Bazel] Migrate to bzlmod for LLVM compatibility (#22771)

LLVM has fully migrated to bzlmod and now requires bzlmod features. This
change migrates IREE's Bazel build to use bzlmod.

Changes:
- Add MODULE.bazel with dependencies matching LLVM's versions
- Add build_tools/bazel/extensions.bzl module extension for creating
IREE-specific repositories
- Enable bzlmod in iree.bazelrc
- Update flatcc BUILD.overlay to use includes= instead of hardcoded
-Iexternal/... paths (bzlmod changes external paths)
- Update bitcode library paths for bzlmod repository naming
- Update llvm-project submodule to include upstream bzlmod changes
- Add BZLMOD_LLVM.md documentation for downstream consumers

The iree_extension creates llvm-raw only when IREE is the root module,
allowing downstream consumers to provide their own LLVM by creating
their own llvm-raw repository.

---------

Signed-off-by: default <bartel@roofline.ai>