Tidy up getFirstNonBoxedLoopFor [NFC]

Move the function getFirstNonBoxedLoopFor which is used in ScopBuilder
and in ScopInfo to Support/ScopHelpers to make it reusable in other
locations. No functionality change.

Patch by Sameer Abu Asal.

Differential Revision: https://reviews.llvm.org/D28754

llvm-svn: 292168