[llvm] [lipo] Support creating Universal 64 bit Mach-O files. (PR #67737)

[Daniel Rodríguez Troitiño via llvm-commits]

drodriguez wrote:

> Please take a look at https://lab.llvm.org/buildbot/#/builders/74/builds/22357

Thanks. It seems to happen outside the lines I directly modified, and from the stack trace seems to happen in some internal buffer of `raw_ostream`. No idea how these changes are triggering something that far. I will try to setup the MSan tomorrow in a Linux machine, I have never done it before.

https://github.com/llvm/llvm-project/pull/67737