[patch] Flatten tree-ssa.h

[Andrew MacLeod <amacleod at redhat dot com>]

When moving all the prototypes out of  tree-flow.h and into individual 
files, the "kitchen sink" #include list temporarily propagated it way 
into the new tree-ssa.h file.  tree-ssa.h is now in a position to 
contain only it's own prototypes.

Its include list was:
#include "bitmap.h"
#include "gimple.h"
#include "gimple-ssa.h"
#include "cgraph.h"
#include "tree-cfg.h"
#include "tree-phinodes.h"
#include "ssa-iterators.h"
#include "tree-ssanames.h"
#include "tree-ssa-loop.h"
#include "tree-into-ssa.h"
#include "tree-dfa.h"

This patch flattens tree-ssa.h so that it no longer includes *any* of 
those include files.  The process, mostly automated:
1 - takes all the #include's from tree-ssa.h and copies them immediately 
before #include "tree-ssa.h" in every .c file which includes it.
2 - Remove each of those include files (as well as tree-ssa.h) one at a 
time from the .c file (bottom up)  and tries to compile it.
3 - Removes any which cause no compilation failures.

This way each .c file gets only the includes it actually needed from 
tree-ssa.h, and often doesn't even require tree-ssa.h itself.  I haven't 
touched any existing includes unless they formed a duplicate of those 
copied from tree-ssa.h. (and that happens)

This touches 147 files (!!!)  which included tree-ssa.h.... only 40 
still need tree-ssa.h.
tree-ssa.h had 11 include files and the average .c file ended up 
requiring only 3.

bootstraps on  x86_64-unknown-linux-gnu with no new regressions. OK?

Andrew

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