GCC vs Clang

[ToeiRei]

I got curious about what clang can do for the kernel. If it's worth it, we could switch over all builds.
But for doing that, I would need a couple of people testing some experimental builds and provide feedback.

Anyone who wants to test is welcome

Info needed in case you're testing:

• CPU running the kernel on
• RAM in the system running the kernel
• System type (virtual machine or physical machine)
• Distro (Debian based - anything that can do deb packages)

Testing procedure:

1. Get/Install the clang built kernel
2. Do a benchmark/test with the clang kernel
3. Get/Install the gcc built kernel
4. Do the same benchmark/test with the gcc kernel to get some reference values