[compiler-rt] [llvm] [ORC] Implement basic reoptimization. (PR #67050)

[via llvm-commits]

Thrrreeee wrote:

Hi @sunho,
I have some questions. For example, in the reoptimization layer, we need to obtain profile information. How can we profile JITed code and then perform PGO? It doesn't seem like this is the case with the ORC JIT yet.
I know that there are `JITlisntener` to support Perf to profile JITed code, but how can we use it in PRC JIT? Dynamic instrumentation  or use other profiler to get profile information?Could you tell me your plan?



https://github.com/llvm/llvm-project/pull/67050