[llvm] (Decomp of #5251 5/n) Add the parallel compilation worker to LlvmProgramImpl #5364
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Related issue = #5252
Decomposition of #5251
We can configure the thread number by
ti.init(compile_thread_num=xxx)
, 0 stands for serial.It‘s not in use in this PR, but it will be used in the following PRs.