[ARM] Use aapcs_vfp for ___truncdfhf2 on v7k.

r215348 overrode the f16 libcalls to be soft-float, but
v7k uses the default (hard-float) calling convention.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273631 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed