Commit Briefs
fix type-punned pointer warnings from gcc
R=rsc http://codereview.appspot.com/396042
Start working through proper handling of pthreads when
debugging Linux core dumps. Pthreads for active processes is still not supported, nor are other systems.
better unwinding for 386.
command-line extraction from core files on linux and freebsd. move linux ureg into ureg386.h (used in many places).