[llvm] [BOLT] Enable cross compilation of runtime libraries (PR #101180)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

Hey folks,

Apart the referenced issues (incl. the recent #157849), I know people working with Android who still apply this patch locally. It'll need a rebase, but it would be great to have this functionality.

@aaupov, you requested some changes [here](https://github.com/llvm/llvm-project/pull/101180#pullrequestreview-2370035138):
> We don't want to introduce dependencies on host cross-compilers all the while Clang can be used for that purpose. We can add the dependency on Clang for cross-target runtimes build if necessary

with @bgergely0 following up [here](https://github.com/llvm/llvm-project/pull/101180#issuecomment-2426192379):
> I have removed gcc cross-compilers all together. Let me know if this is what you meant, or other changes you think are needed.

Just checking if those have been addressed or if any concerns remain, so we can unblock this.
Thanks a lot!




https://github.com/llvm/llvm-project/pull/101180