modified scheduler

changed name prefix for SSE floating point nodes from f to x

comments added

creates a CopyKeep to prevent the usage of esp before it is copied to ebp
ia32_isa_t structure now includes the arch_isa_t (real derivation)

a be_return feven if there was none (as it happens in endless loops)

Moved the initial IncSP before teh Barrier. This prevents spilling (which uses fp)
to be done before sp is increased, arghhh

added UKNWN register
set Unknown nodes to ignore and assign them the UKNWN register

fixed copy insertion

fixed indents
added should be same constraint for lea
added additional statistics

ABI provides additional ignore registers in a set