ARM long branch stubs: be8

[Christophe LYON]

Hi all,

Following our recent discussion, I propose the attached patch to fix 
big-endian / be8 stubs encoding issues.

I am not particularly proud of the way it's now done, but it does the job.
In short, the Thumb instructions in the stubs now use 1 entry per 
instruction (instead of 2 instr per entry), but this implies that the 
encoding functions know the exact layout of each stub, so it makes 
maintenance a bit more painful (I added some comments to warn about that).

I have added one more test (farcall-thumb-arm-be8).

Once this is OK, I'll come back to my original patches to improve 
PIC/PLT support.

Christophe.
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