move MayAliasSet.cpp into lib/Analysis

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@194921 91177308-0d34-0410-b5e6-96231b3b80d8
factor out code in shouldEnablePolly

to be able to call the same functionality from registerPollyEarlyAsPossiblePasses
and registerPollyOptLevel0Passes.

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@194922 91177308-0d34-0410-b5e6-96231b3b80d8
prepend LLVM to all Polly* libs

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@194923 91177308-0d34-0410-b5e6-96231b3b80d8