Raw-IR modules (`__llvmir__` / `__mlir__`) were the last common case that still needed
child processes: llvm-link merged the `.raw.ll` sidecar into the translated module, then
`opt -passes=always-inline,globaldce` inlined the raw bodies. Both now run inside the DLL:
- new `ircore_mlir_to_obj_raw(mlir, len, raw_ir, raw_ir_len, ...)`: the sidecar is parsed
into the same LLVM context, merged with LLVMLinkModules2, then run through
always-inline,globaldce via LLVMRunPasses (IRCORE_FLAG_INLINE covers the `.inline`
marker case, which has no sidecar)
- the worker reads the sidecar itself with stdlib buffers (MemBuddy is not thread-safe),
so `.ll.pre`, `.ll.link` and `.ll.inline` intermediates are gone as well
- LLVMLinkModules2 is exported by libLLVM-22.dll but no longer declared in the llvm-c
headers we build against, so it is declared by hand (stable C ABI)
- PhaseB falls back to the legacy flow only for --phase2command now
Verified: RawIRTest runs through ircore with no `.mlir.opt`/`.ll.pre`/`.ll.link`/
`.ll.inline` leftovers and prints the same results as the legacy build; the FFI suite
gained a raw-merge check (the sidecar symbol is undefined without it, linked and inlined
away with it); TestFBProject (also uses __llvmir__) and 12 representative projects pass.
TermiNexus
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