[4/6] ARM Neon Intrinsic Tablegen Test Generator.

Added code to NeonEmitter::runTests so that GenTest gets all of the needed
arguments to invoke the neon test generation methods.

Reviewed by Bob Wilson.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179640 91177308-0d34-0410-b5e6-96231b3b80d8