Cleanup: Switch the preprocessor to err_pp_expected_after

This is approaching consistency but the PP and Parse categories they still have
slightly different wording:

def err_pp_expected_after : Error<"missing %1 after %0">;
def err_expected_after   : Error<"expected %1 after %0">;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198189 91177308-0d34-0410-b5e6-96231b3b80d8
Fix and reword some typos

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198191 91177308-0d34-0410-b5e6-96231b3b80d8
For AArch64 Neon, simplify scalar dup by lane0 for fp.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198195 91177308-0d34-0410-b5e6-96231b3b80d8