Compilation performance comparison of 3.5.0 and TreeSSA trees on MICO sources as requested in: [tree-ssa] Merge status 2004-05-03

[Laurent GUERBY]

A -Og flag that would do all optimizations that

- don't take too much time and memory ressources
- still allow perfect debugability
- tend to generate smalled code and debug information

Would be just perfect :). 

I would fix a rule to allow up to 5-10%
more compile time and memory at -Og than -O0
and zero gdb breakage.

But such optimization should be likely to reduce compile time anyway...

Laurent