[llvm] [Support] Vendor rpmalloc in-tree and use it for the Windows 64-bit release (PR #91862)

[Alexandre Ganea via llvm-commits]

aganea wrote:

> I think there are still some unresolved comments from my review, but I'm all for getting this merged.

@zmodem Could you please point me specifically to which comments were unresolved? I think I’ve answered here: https://github.com/llvm/llvm-project/pull/91862#issuecomment-2107491507

https://github.com/llvm/llvm-project/pull/91862