6390492 tudebugbpt isn't expecting T_SGLSTP to have user regs

[dan.m...@sun.com]

Author: dmick
Repository: /hg/onnv/onnv-gate
Revision: 7e15b409407a2f4c4efa67c875f0657484a07eb9
Log message:
6390492 tudebugbpt isn't expecting T_SGLSTP to have user regs

Files:
        update: usr/src/uts/i86pc/os/trap.c