RFC: Use tree/rtx/rtvec instead of "union ...*'" in headers.

[Steven Bosscher]

Hi,

The idea behind this patch is that since the introduction of 
coretypes.h, tree, rtx, and rtvec are defined in most files, so the 
headers can use them too.  I have tried to make sure that all files that 
include the headers this patch touches first include coretypes.h.

This has been hanging around in my tree now for a week or so, but 
mainline _still_ doesn't build on Cygwin, even with an updated gawk (now 
it is OPT__version that is missing for some silly reason <sigh>...).  
Ergo, completely untested, though it seems to compile just fine.

I'd like to hear if this change is a good idea. And maybe someone can 
pick it up and finish it while I'm still search for a computer with a 
decent OS...

Gr.
Steven

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