TODO list:

- relocate .stabs information
- fix -I search order (same as gcc)
- dynamic hash table resizing
- better section generator (suppress mmaps)
- relocate .bounds section content
- add size info on all ELF symbols
- add separate symbol/offset handling
- better local variables handling (needed for other targets)
- handle void (__attribute__() *ptr)()
- To check: bound checking and float/long long/struct copy code
- To fix: 'sizeof' generate code if too complex expression is given.
- fix bound check code with '&' on local variables (currently done
  only for local arrays).
- win32: add __stdcall, __intxx. use resolve for bchecked malloc et
  al. check GetModuleHandle for dlls. check exception code (exception
  filter func).

Not critical:

- add PowerPC or ARM code generator and improve codegen for RISC (need
  to suppress VT_LOCAL and use a base register instead).
- interactive mode / integrated debugger
- fix multiple compound literals inits in blocks (ISOC99 normative
  example - only relevant when using gotos! -> must add boolean
  variable to tell if compound literal was already initialized).
- fix L"\x1234" wide string case (need to store them as utf8 ?)
- fix preprocessor symbol redefinition
- better constant opt (&&, ||, ?:)
- add portable byte code generator and interpreter for other
  unsupported architectures.
- C++: variable declaration in for, minimal 'class' support.