[reland] [lit] [compiler-rt] Add llvm-lit global command cache to speed up test config (#196152) Re-lands #195888 Fixes two issues: - `date -Ins` is not available on older macOS versions (I think pre-15.4). This caused the new `test_cache` test to fail. Switched to just using `date` + a sleep (with a comment explaining why). Even if the sleep is too long/short, the test should still pass. - `functools.cache` is not available on Python 3.8. I've moved the `_memoize` helper out of TestRunner.py into util.py, and switched to it instead. I had to make a small change to the memoize helper to support arbitrary args/kwargs.
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