[Runtime] Parallel-for with threading backend #16133
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This PR introduces the runtime parallel-for helper function in C++ with the threading backend in TVM. Right now the existing [parallel-for](https://github.com/apache/tvm/blob/bd67d2e5ebde1aec18bcfa74c087516579bda1ae/include/tvm/support/parallel_for.h#L48-L68) in TVM is not thread persistent, in which case we cannot get persistent TLS for each thread. The introduced parallel-for-with-threading-backend function leverages the threading backend in TVM and persists threads.
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This PR introduces the runtime parallel-for helper function in C++ with the threading backend in TVM.
Right now the existing parallel-for in TVM is not thread persistent,
in which case we cannot get persistent TLS for each thread.
The introduced parallel-for-with-threading-backend function leverages the threading backend in TVM and persists threads.