[llvm] [llvm-config] Quote and escape paths (PR #97305)

[Tóth Ambrus via llvm-commits]

tothambrus11 wrote:

Another approach would have been to only add quotes when there is a space in the path. If old tooling relied on such things, it was broken anyways (there is no way of correctly splitting unless we add some hard assumptions). But `--escaped` is good for backwards compatibility in all cases.

https://github.com/llvm/llvm-project/pull/97305