tools: remove unnecessary copy of array_lengthof

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206115 91177308-0d34-0410-b5e6-96231b3b80d8
Make helper static and place random global into the llvm namespace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206116 91177308-0d34-0410-b5e6-96231b3b80d8
Spell the specialization namespace correctly.

Not sure why clang didn't diagnose this (GCC does).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206117 91177308-0d34-0410-b5e6-96231b3b80d8