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

Added GenerateChecksForIntrinsic method to generate FileCheck patterns
for generated arm neon tests.

Reviewed by Bob Wilson.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179644 91177308-0d34-0410-b5e6-96231b3b80d8