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84fe1f63b0
The find-dynamic-unwind-info callback registration APIs in libunwind limit the number of callbacks that can be registered. If we use multiple UnwindInfoManager instances, each with their own own callback function (as was the case prior to this patch) we can quickly exceed this limit (see https://github.com/llvm/llvm-project/issues/126611). This patch updates the UnwindInfoManager class to use a singleton pattern, with the single instance shared between all LLVM JITs in the process. This change does _not_ apply to compact unwind info registered through the ORC runtime (which currently installs its own callbacks). As a bonus this change eliminates the need to load an IR "bouncer" module to supply the unique callback for each instance, so support for compact-unwind can be extended to the llvm-jitlink tools (which does not support adding IR).