[PPC64] Added vector registers.
The Registers_ppc64 class needed a couple of changes, both to accommodate the
new registers as well as to handle the overlaps of VS register set
without wasting space.
The save/restore code of V and VS registers was added.
As VS registers depend on the VMX extension, they are processed only if
VMX support is detected (_ARCH_PWR8 for now).
Patch by Leandro Lupori!
Differential Revision: https://reviews.llvm.org/D41906
git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@322596 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed
