[misc] Show suggestion when locking metadata.lock fails #6919
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Issue: #4401
Brief Summary
I found that some users' programs warn the
"[W ... Lock C:/taichi_cache/ticache/llvm/metadata.lock failed"
.I think the crash when loading old version cache files which were generated by old version taichi-nightly could cause the warning. But I'm not sure.
Temporarily, show a message to suggest the user remove this
.lock
file manually.And I will provide
python -m taichi clean_ticache
to allow user to clean the cache files manually.