Get AMD64 slightly further before dying:
- implemented VG_(do_syscall)()
- fixed a problem in ume.c with mapping when loading, which was causing
  stage2's memory to be trashed
- fixed stage2.lds substitution so stage2 goes in the right address



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3156 a5019735-40e9-0310-863c-91ae7b9d1cf9
3 files changed