[compiler-rt] [llvm] [lit] [compiler-rt] Add llvm-lit global command cache to speed up test config (PR #195888)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

Looks like `date -Ins` might not be portable.

Also looks like `functools.cache` isn't available until python 3.9...

https://github.com/llvm/llvm-project/pull/195888