Add missing __aeabi_fcmpun alias to match C version.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199386 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] Fix a build warning on windows.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199390 91177308-0d34-0410-b5e6-96231b3b80d8