[builtins] Add __cmpsf2 for ARM version of comparesf2

The generic version of comparesf2 defines __cmpsf2 alias for libgcc
compatibility, but the ARM overlay is missing the alias.

Differential Revision: https://reviews.llvm.org/D60805

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358542 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed