Initial check-in of "fancy" inlined stepping. Doesn't do anything useful...

Initial check-in of "fancy" inlined stepping.  Doesn't do anything useful unless you switch LLDB_FANCY_INLINED_STEPPING to true.  With that
on, basic inlined stepping works, including step-over of inlined functions.  But for some as yet mysterious reason i386 debugging gets an
assert and dies immediately.  So for now its off.

llvm-svn: 163044