[RuntimeDyld][ELF][AArch64] Fix resolveAArch64ShortBranch. (#92245)

We don't know the load addresses when this function is called, so it
shouldn't be trying to use them to determine whether or not the branch
is short. Notably, this will fail in the case where the code is being
loaded into a target in such a way that the section offsets differ
between the process generating the code and the target process.

rdar://127673408