RFR(S): 8016696: PPC64 (part 4): add relocation for trampoline stubs

[Lindenmaier, Goetz]

Hi,

On PPC, we use special stubs we call trampoline stubs for calls to
target addresses that can not be encoded as offset in the branch
instruction.
A trampoline allows to encode a small branch in the code, even if
there is the chance that this branch can not reach all possible code
locations. If the relocation finds that a branch is too far for the
instruction in the code, it can patch it to jump to the trampoline
where is sufficient space for a far branch.

To implement this, we extended the relocations by a new kind,
trampoline_stub_Relocation:
http://cr.openjdk.java.net/~goetz/webrevs/8016696-trampoline/

Aditionally to the code in 0004_opto-trampoline_relocations.patch
I added debug printing functionality.

Could I get a review on this change, please?

Thanks,
  Goetz.
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