Untangle ScopInfo lit-testcases from specifics of the legacy-PM

Summary:
For the ScopInfo lit testsuite, this patch removes some dependences on output behaviour of the legacy PM.

In most cases, these tests checked the tool output for labels created by the pass printer in the legacy PM. This doesn't work for the new PM anymore. Untangling the testcases is the first step to porting the testsuite for the new PM infrastructure.

Reviewers: grosser, Meinersbur, bollu

Reviewed By: grosser

Subscribers: llvm-commits, pollydev

Tags: #polly

Differential Revision: https://reviews.llvm.org/D35727

llvm-svn: 308754