[patch 1/3] Flatten gimple.h

[Andrew MacLeod <amacleod at redhat dot com>]

The final gimple re-org patch!

These patches move the #includes out of gimple.h and into the .c files 
which include gimple.h.  They are:

#include "pointer-set.h"
#include "hash-table.h"
#include "vec.h"
#include "ggc.h"
#include "basic-block.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "gimple-fold.h"
#include "tree-eh.h"
#include "gimple-expr.h"
#include "is-a.h"

The first patch is the core changes, plus the #include changes in the 
core compiler directory.

I moved recalculate_side_effects() from gimple.c to gimplify.c. 
gimplify.c was the primary consumer, and the only other caller was in 
the ada front end.  By moving it, the ada front end doesn't need 
gimple.h any more.

I also trimmed out any  .h file introduced which the .c file does not 
require.  None of these specific .h files appear to have any ordering 
issues, so this should be safe.

The second patch has the language front end changes. its only the 
${language}-gimplify.c files which now actually require gimple.h itself 
(yay).  I also trimmed out the #includes which were introduced but not 
required there as well.

The third patch has the config/*  target changes, as well as a few 
testcases.  I did *not*  trim out  includes for the targets since I got 
caught earlier with targets requiring some files on only some 
configurations.  I did go through an remove any duplicates that were 
introduced tho. (ie, if basic-block.h was already being included, I 
removed the duplicate which flattening introduced.) I didn't try 
reducing the includes in the testcases since that doesn't really matter.

I did run make all-gcc on all the targets in config-list.mk, and don't 
appear to have caused any new failures... the failures that are there 
appear to be unrelated to compilation of the changed files.

Is there anything in particular one needs to do for plugins? I thought I 
saw a patch somewhere that changed something in the Makefile, but don't 
know if that is actually required since I never did that for any of the 
others.   Any plugin which used gimple.h probably needs a few more 
includes...

This bootstraps on x86_64-unknown-linux-gnu, and regressions are 
currently running.  Assuming it passes fine, OK?

Andrew

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