[SCEV] When printing via -analysis, dump loop disposition

There are currently some bugs in tree around SCEV caching an incorrect
loop disposition.  Printing out loop dispositions will let us write
whitebox tests as those are fixed.

The dispositions are printed as a list in "inside out" order,
i.e. innermost loop first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268177 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed