Assert that TDP_NOFAULTING and TDP_NOSPEEPING thread flags do not leak when thread returns from a syscall to usermode.
Assert that TDP_NOFAULTING and TDP_NOSPEEPING thread flags do not leak
when thread returns from a syscall to usermode.

Tested by:	pho
MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase