Revert "Another attempt to sizing framebuffer based on fmt"

This reverts commit c0e8893560b74b5e9b19104584faa2578f576925.
Add option to the JIT viewer to find a random block with VFPU instructions.

For inspection of jit results.
Re-enable the "nice delay slot" optimization on ARM
ARM: Some zero-register fixes
Implement vsgn in x86/x64 and ARM jit