[llvm] DXIL: Use correct type ID when writing ValueAsMetadata. (PR #94337)

[Chris B via llvm-commits]

llvm-beanz wrote:

Unfortunately the always casting to and from the typed pointer doesn't work for DXIL because DXIL disallows bitcasts for a lot of cases, and that is enforced by the DXIL validator which operates on typed pointer IR.

https://github.com/llvm/llvm-project/pull/94337