aco/gfx10: Fix mitigation of VMEMtoScalarWriteHazard.

aco/gfx10: Fix mitigation of VMEMtoScalarWriteHazard.

This commit refines the VMEMtoScalarWriteHazard mitigation, based
upon a closer look at what LLVM does. Also changes the code to
match the structure of the other hazard mitigations.

* The hazard is not only triggered by VMEM, FLAT and GLOBAL
  but also SCRATCH and DS instructions.
* The SMEM/SALU instructions only cause a hazard when they
  write a register that the VMEM/etc. are reading.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>