[tree-ssa] Mainline merge as of 2003-07-22

[Diego Novillo]

To prove that I'm glutton for pain, I just finished another merge
against mainline as of 2003-07-22.  This fixes the bootstrap problems
for PPC and introduces no new failures.

IA64 is only bootstrapping because I added a hideous hack that I will be
removing soon.  When propagating copies, we don't allow propagation when
DECL_LANG_FLAG_4 is set for the variable that we are copying to.  This
is what the C-family front ends use to indicate that the variable has an
__asm__ modifier.  Clearly this needs a better language-independent
solution.


Bootstrapped and tested x86, ia64, amd64 and ppc.


Diego.