[PowerPC]Activate "vector bool long long" (and alternate spellings) as a valid...

[PowerPC]Activate "vector bool long long" (and alternate spellings) as a valid type for Altivec support for Power.

There are two test case updates for very basic testing. While I was editing cxx-altivec.cpp I also updated it to better match some other changes in altivec.c.

Note: "vector bool long" was not also added because its use is considered deprecated.

http://reviews.llvm.org/D7235

llvm-svn: 231118