[BOLT-AArch64] Support SPEC17 programs and organize AArch64 tests

Summary:
Add a few new relocation types to support a wider variety of
binaries, add support for constant island duplication (so we can split
functions in large binaries) and make LongJmp pass really precise with
respect to layout, so we don't miss stubs insertions at the correct
places for really large binaries. In LongJmp, introduce "freeze"
annotations so fixBranches won't mess the jumps we carefully determined
that needed a stub.

(cherry picked from FBD6294390)