[lldb] (Prepare to) speed up dwarf indexing (#118657) Indexing a single DWARF unit is a fairly small task, which means the overhead of enqueueing a task for each unit is not negligible (mainly because introduces a lot of synchronization points for queue management, memory allocation etc.). This is particularly true if the binary was built with type units, as these are usually very small. This essentially brings us back to the state before https://reviews.llvm.org/D78337, but the new implementation is built on the llvm ThreadPool, and I've added a small improvement -- we now construct one "index set" per thread instead of one per unit, which should lower the memory usage (fewer small allocations) and make the subsequent merge step faster. On its own this patch doesn't actually change the performance characteristics because we still have one choke point -- progress reporting. I'm leaving that for a separate patch, but I've tried that simply removing the progress reporting gives us about a 30-60% speed boost.
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