[RuntimeDyld] Apply padding and alignment bumps to all sections with stubs, and

[RuntimeDyld] Apply padding and alignment bumps to all sections with stubs, and
increase the MachO/x86-64 stub alignment to 8.

Stub alignment should be guaranteed for any section containing RuntimeDyld
stubs/GOT-entries. To do this we should pad and align all sections containing
stubs, not just code sections.

This commit also bumps the MachO/x86-64 stub alignment to 8, so that GOT entries
will be aligned.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362139 91177308-0d34-0410-b5e6-96231b3b80d8