lima/ppir: don't clone texture loads

lima/ppir: don't clone texture loads

Cloning texture loads isn't a good idea since we may move it into
a block that is not shared between all the invocations of the shader.
We'd like to avoid that since it may result in undefined behavior.

Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>