[llvm] [TableGen] Avoid repeated hash lookups (NFC) (PR #107669)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

> Nice. Are there any good static analysis tools for detecting repeated hash lookups?

Thanks!  I am not aware of one.  I basically do `ag -B5 "(insert|try_emplace)\("` and then look for `find` and `contains` in the output, where `ag` is a faster version of `find | xargs grep`.

https://github.com/llvm/llvm-project/pull/107669