panfrost/midgard: Prettify embedded constant prints

Until now, embedded constants were printed as all 32 bits integer or floats, but the compiler can pack constant from different types if severa instructions with different reg_mode and native type refer to the constant register. Let's implement something smarter so users don't have to do a manual conversion when looking at a trace.

Signed-off-by: Boris Brezillon boris.brezillon@collabora.com /cc @alyssa