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

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> I will try to setup the MSan tomorrow in a Linux machine, I have never done it before.

Usually, if it can't be fixed immediately, it should be reverted.

I guess 55d8f0cd31311ed3ebc85bef2c9b5cfca1579076 is the fix, fat_arch_64::reserved is uninitialized.
The fix should not affect correct code, but please feel free to improve if you have better fix.



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