Prepare unit tests for update to ISL 0.16

ISL 0.16 will change how sets are printed which breaks 117 unit tests
that text-compare printed sets. This patch re-formats most of these unit
tests using a script and small manual editing on top of that. When
actually updating ISL, most work is done by just re-running the script
to adapt to the changed output.

Some tests that compare IR and tests with single CHECK-lines that can be
easily updated manually are not included here.

The re-format script will also be committed afterwards. The per-test
formatter invocation command lines options will not be added in the near
future because it is ad hoc and would overwrite the manual edits.
Ideally it also shouldn't be required anymore because ISL's set printing
has become more stable in 0.16.

Differential Revision: http://reviews.llvm.org/D16095

llvm-svn: 257851