[llvm] [LLVM-C] Move LLVMDISubrangeTypeMetadataKind to end of LLVMMetadataKind enum (PR #132268)

[via llvm-commits]

alan-j-hu wrote:

Also brought OCaml bindings up to date with the LLVMMetadataKind enum (there were some constants in the C enum that were missing corresponding cases in the OCaml type)

https://github.com/llvm/llvm-project/pull/132268