IndependentBlocks: Add a couple of test cases.

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@177438 91177308-0d34-0410-b5e6-96231b3b80d8
ScopDetect: Remove some redundant semicolons

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@177444 91177308-0d34-0410-b5e6-96231b3b80d8