Emitting THUNKS for Thumb code

[Richard Earnshaw]

I'm trying to solve a problem I've come across with the generation of 
thunks for Thumb code.  The ASM_OUTPUT_MI_THUNK code is currently written 
to work only in ARM mode, but the thumb equivalent would be so long that 
it is more efficient to switch into ARM mode, execute the thunk and then 
branch back again.

However, I'm running into a problem.  In order to do this efficiently I 
need to mark the label at the start of the thunk as being an ARM code 
label.  The following patch achieves this, but has the nasty consequence 
that the arm back-end needs to include cp/cp-tree.h so that I can access 
the language-specific tree fields (since we have two ways of generating 
thunks, one using ASM_OUTPUT_MI_THUNK and one using a normal call-return 
sequence).  This seems to be the wrong approach to me, but I can't think 
of anything else.

Does anyone have a better solution to this?

R.
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