Vega (gfx900) introduced new memory aperture registers to get the base
address and limit for LDS and private (scratch) memory. These have not
commonly been used by the compiler until ROCm 6. Now that the compiler
is generating reads from these special registers, implement the support
for them.
Tested with LULESH which is using the SHARED_BASE register (LDS) with
ROCm 6.0. This assembly seems to replace S_GETREG_B32 emitted by the
ROCm 5 compiler.
Change-Id: Id2bd26ce8ef687c84a647fa2ac2da54d657913e5
44c78d843c