[FastISel][AArch64] Add sqrt intrinsic support.

Fixes <rdar://problem/17867067>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214388 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel][AArch64] Add basic bitcast support for conversion between float and int.

Fixes <rdar://problem/17867078>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214389 91177308-0d34-0410-b5e6-96231b3b80d8