[AArch64] Add support for NEON scalar floating-point convert to fixed-point instructions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194395 91177308-0d34-0410-b5e6-96231b3b80d8
Add test for r194350.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194396 91177308-0d34-0410-b5e6-96231b3b80d8
ObjectiveC migrator. More testing of instancetype migration in
method implementations. // rdar://15438505


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194402 91177308-0d34-0410-b5e6-96231b3b80d8