fix gc bug causing make smoketest to die in cmd/gofmt.

saving of sp was too far away from use in scanstack;
the stack had changed since the sp was saved.

R=r
DELTA=9  (4 added, 2 deleted, 3 changed)
OCL=32232
CL=32237
2 files changed
tree: 9be9c037efe1ecdef25642340a87db8cbf9be81d
  1. doc/
  2. include/
  3. lib/
  4. misc/
  5. pkg/
  6. src/
  7. test/
  8. usr/