ARM: switch armv7em MachO triple to hard-float defaults and libcalls.

We were emitting incorrect calls to libm functions that LLVM had decided it
knew about because the default is soft-float.

Recommitted without breaking ELF this time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337450 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed