mesa: etnaviv: fix shader miscompilation with more than 16 labels
The labels array may change its virtual address on a reallocation, so
it is invalid to cache pointers into the array. Rather than using the
pointer directly, remember the array index.
Fixes miscompilation of shaders in glmark2 ideas, leading to GPU hangs.
This is a backport from 17.1.5.
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> Signed-off-by: Ross Burton <ross.burton@intel.com>
