[XLA:MSA] Adding two debugging functions for memory space assignment to facilitate reproduction of production bugs in small tests through steering decisions at two key points in the MSA pass flow, before and after AllocateSegment() call:

[XLA:MSA] Adding two debugging functions for memory space assignment to facilitate reproduction of production bugs in small tests through steering decisions at two key points in the MSA pass flow, before and after AllocateSegment() call: #65864