[llvm] [BOLT] Enable standalone build (PR #97130)

[Rafael Auler via llvm-commits]

rafaelauler wrote:

The reality is that BOLT has been working for a while with the assumption that the libs are in the lib folder even when not installed (just built). We have internal deployment systems that rely on this and while I could fix this after patch lands, I'm sure this will take by surprise other downstream systems that also deploy BOLT and rely on this.

So to minimize the pain I would appreciate if somehow these libs could go into the "lib" folder alongside "bin" where bolt is. If this is not possible, then that's another story and we can land this and deal with the consequences, and break stuff downstream. But we need a good reason to break stuff like that.

https://github.com/llvm/llvm-project/pull/97130