Automatic DMA generation for simple cases.

- constant bounded memory regions, static shapes, no handling of
  overlapping/duplicate regions (through union) for now; also only, load memory
  op's.
- add build methods for DmaStartOp, DmaWaitOp.
- move getMemoryRegion() into Analysis/Utils and expose it.
- fix addIndexSet, getMemoryRegion() post switch to exclusive upper bounds;
  update test cases for memref-bound-check and memref-dependence-check for
  exclusive bounds (missed in a previous CL)

PiperOrigin-RevId: 220729810