Use braces in multi-statement DEBUG() code [NFC]

By adding braces into the DEBUG statement we can make clang-format format code
such as:

  DEBUG(stmt1(); stmt2())

as multi-line code:

  DEBUG({
    stmt1();
    stmt2();
  });

This makes control-flow in debug statements easier to read.

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@220441 91177308-0d34-0410-b5e6-96231b3b80d8
Use stringFromIslObj instead of isl_..._dump to print to dbgs()

This makes sure we consistently use dbgs() when printing debug output.
Previously, the code just mixed calls to isl_*_dump() with printing to dbgs()
and was relying for both methods to interact in predictable ways (same output
stream, no unexpected reordering of outputs).

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@220443 91177308-0d34-0410-b5e6-96231b3b80d8
Remove incorrect value description for -enable-polly-aligned

The description of the parameter value passed to -enable-polly-aligned did
not make any sense at all, but was just a leftover coming from when this option
was copied form -enable-polly-openmp. We just drop it as the option description
gives sufficient information already.

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@220445 91177308-0d34-0410-b5e6-96231b3b80d8
Fix typo

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@220446 91177308-0d34-0410-b5e6-96231b3b80d8