Correct a missing RUN line in the ARM codegen test for fneg ops. We should...

Correct a missing RUN line in the ARM codegen test for fneg ops. We should also explicitly specify +/-neonfp.

The bug was introduced at r99570 when use of "-arm-use-neon-fp" was removed.

Differential Revision: http://reviews.llvm.org/D4846

llvm-svn: 215377