[clang] [CMake][Release] Build with -ffat-lto-objects (PR #140381)

[Tom Stellard via cfe-commits]

tstellar wrote:

I figured out how to strip the binaries, so I've updated the patch.  Though, you could argue that people should only be using these libraries with the compiler that comes with the release package, and in that case the LTO bitcode would be useful. However, the release package is already huge, so I think overall it's better to strip LTO bitcode and keep the packages smaller.  We can always revisit the stripping later.

https://github.com/llvm/llvm-project/pull/140381