TODO


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- finish segment ops (call far, ret far, load_seg suppressed)
- fix arm fpu rounding (at least for float->integer conversions)
- fix CCOP optimisation
- optimize FPU operations (evaluate x87 stack pointer statically) 
- fpush not before mem load restarting
- fix all remaining thread lock issues (must put TBs in a specific invalid
  state, find a solution for tb_flush()).
- add gcc 2.96 test configure (some gcc3 flags are needed)
- add IPC syscalls

lower priority:
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- use -msoft-float on ARM
- use kernel traps for unaligned accesses on ARM ?
- handle rare page fault cases (in particular if page fault in heplers or
  in syscall emulation code).
- fix thread stack freeing (use kernel 2.5.x CLONE_CHILD_CLEARTID)
- more syscalls (in particular all 64 bit ones, IPCs, fix 64 bit
  issues, fix 16 bit uid issues)
- use page_unprotect_range in every suitable syscall to handle all
  cases of self modifying code.
- use gcc as a backend to generate better code (easy to do by using
  op-i386.c operations as local inline functions).
- add SSE2/MMX operations