[patch] New backend header reduction

[Andrew MacLeod <amacleod at redhat dot com>]

Just finished running...  I think the external hard drive was slowing 
down this run :-P  It took quite a while.

Anyway, this is the reduction patch independent of the header-ordering 
patch... ie, that patch needs to be applied before this one.   So this 
should be mostly just removals.   I also need to follow up and build all 
the target and bootstrap from scratch to make sure there arent any 
weirdnesses with it.   But you can at least get a look at it now.

a few interesting stats:

Top reductions:

passes.c: Reduction performed, 26 includes removed.
shrink-wrap.c: Reduction performed, 21 includes removed.
ipa-polymorphic-call.c: Reduction performed, 21 includes removed.
lto-cgraph.c: Reduction performed, 19 includes removed.
ddg.c: Reduction performed, 19 includes removed.
tree-ssa-pre.c: Reduction performed, 18 includes removed.
lra-remat.c: Reduction performed, 18 includes removed.
cgraph.c: Reduction performed, 18 includes removed.
cgraphclones.c: Reduction performed, 18 includes removed.
tsan.c: Reduction performed, 17 includes removed.
tree-into-ssa.c: Reduction performed, 17 includes removed.
lto-section-in.c: Reduction performed, 17 includes removed.

And headers most often removed:

alias.h: Removed 230 times.
flags.h: Removed 207 times.
internal-fn.h: Removed 143 times.
stmt.h: Removed 128 times.
dojump.h: Removed 122 times.
expmed.h: Removed 115 times.
explow.h: Removed 115 times.
varasm.h: Removed 114 times.
calls.h: Removed 114 times.
expr.h: Removed 81 times.
insn-config.h: Removed 77 times.
emit-rtl.h: Removed 62 times.
hard-reg-set.h: Removed 60 times.
tm_p.h: Removed 56 times.
fold-const.h: Removed 56 times.
diagnostic-core.h: Removed 53 times.
except.h: Removed 51 times.

I also have the full logs if any questions arise.
Andrew

Attachment: backend-reduce.diff.bz2
Description: application/bzip