freedreno: move ir3 to common location

freedreno: move ir3 to common location

Move (most of) the ir3 compiler to src/freedreno/ir3 so that it can be
re-used by some future vulkan driver.  The parts that are gallium
specific have been refactored out and remain in the gallium driver.

Getting the move done now so that it can happen before further
refactoring to support a6xx specific instructions.

NOTE also removes ir3_cmdline compiler tool from autotools build since
that was easier than fixing it and I normally use meson build.  Waiting
patiently for the day that we can remove *everything* from the autotools
build.

Signed-off-by: Rob Clark <robdclark@gmail.com>