[llvm] [llvm] fix mustache template whitespace (PR #153724)

[Paul Kirth via llvm-commits]

ilovepi wrote:

I actually have a big stack of PRs that address the Mustache impl. I probably should have posted this a bit sooner. The stack starts here: https://github.com/llvm/llvm-project/pull/159182 and adds lots of missing functionality and some minor perf optimizations at the end.

I'm happy to review your patches, but given that there's another patch set that will implement more features I'm not too sure. Feedback on that stack is welcome, since its still definitely what I'd call a first draft, but it does get us to where we want.

https://github.com/llvm/llvm-project/pull/153724