For each type, maintain a list of stack slots used to spill
SSA values to the stack.  Reuse those stack slots for noninterfering
spills.

Lowers frame sizes.  As an example, runtime.mSpan_Sweep goes from
584 bytes to 392 bytes.  heapBitsSetType goes from 576 bytes to 152 bytes.

Change-Id: I0e9afe80c2fd84aff9eb368318685de293c363d0
Reviewed-on: https://go-review.googlesource.com/16022Reviewed-by: David Chase <drchase@google.com>