Joshua Batista c8b3d79961 [DXIL] Remove incompatible metadata types when preparing DXIL. (#136386) ...

This PR introduces a Metadata Node Kind allowlist. The purpose is to
prevent newer Metadata Node Kinds to be used and inserted into the
outputted DXIL module. Only the metadata kinds that are accepted in the
DXIL Validator are on the allowlist. The Github DXC validator doesn't
support these newer Metadata Node Kinds, so we need to filter them out.

We introduce this restrictive allowlist into LLVM and strip all metadata
that isn't found in the list.

The accompanying test would add the `llvm.loop.mustprogress` metadata
node kind, but thanks to the allowlist, filters it out, and so the
whitelist is proven to work.
The test also has two separate metadata kinds that are on the allowlist,
and remain after the DXIL Prepare pass.

2025-04-28 12:43:38 -07:00

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