In PatchTrampolineAndStubCalls, use a second iterator over the original
relocation info, to avoid having to reconstruct the original target of
the branch by manually applying the delta between the old and new code.

This way, we do not need to make assumptions regarding how code targets are
encoded.


Change-Id: I551ad8a3a654ead63ea88c8ce1d8c9e1927436b0
Reviewed-on: https://chromium-review.googlesource.com/995442Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
Cr-Commit-Position: refs/heads/master@{#52365}