improve altivec vector bool/pixel support, patch by Anton Yartsev
with several tweaks by me.

llvm-svn: 106619
17 files changed
tree: 8823447a65934f464cda11172b9048e57c12f761
  1. clang/
  2. compiler-rt/
  3. libcxx/
  4. lldb/
  5. llvm/