statement naming

- A recent ppcg/isl update caused the grid/block size upper bounds to
deviate by one from the oracle. This is not an effect that's visible at
runtime.
- Statement naming changed in polly. Update the testcases.

llvm-svn: 333090

Summary:
This information is necessary for PPCG to perform correct life range reordering.
With these changes applied we can live-range reorder some of the important
kernels in COSMO.

We also update and rename one test case, which previously could not be optimized
and now is optimized thanks to live-range reordering. To preserve test coverage
we add a new test case scalar-writes-in-scop-requires-abort.ll, which exercises
our automatic abort in case of scalar writes in the kernel.

Reviewers: Meinersbur, bollu, singam-sanjay

Subscribers: nemanjai, pollydev, llvm-commits, kbarton

Tags: #polly

Differential Revision: https://reviews.llvm.org/D36929

llvm-svn: 311259

- There is a conditional branch that is used to switch between the old
   and new versions of the code.

- If we detect that the build was unsuccessful, `PPCGCodeGeneration` will
  change the runtime check to be always set to false.

- To actually *reach* this runtime check instruction, `PPCGCodeGeneration`
  was using assumptions about the layout of the BBs.

- However, invariant load hoisting violates this assumption by inserting
  an extra basic block in the middle.

- Fix the assumption on the layout by having `createScopConditionally`
   return the conditional branch instruction.

- Use this reference to set to always-false.

llvm-svn: 308010