981932bc57
1. parallel-loop-collapsing is renamed to test-scf-parallel-loop-collapsing. 2. The pass adds various checks to provide error messages instead of hitting assert failures. 3. Testing is added to verify these error messages This is roughly an NFC. The name changes, but all checked behavior previously would have resulted in an assertion failure. Almost no new support is added, so this pass is still limited in scope to testing the transform behaves correctly with input arguments that perfectly match the ParallelLoop's iterator arg set. The one new piece of functionality is that invalid operations will now be skipped with an error messages instead of producing an assertion failure, so the pass can be used with expected failures for pieces of the IR not cared about with a specific RUN command. Differential Revision: https://reviews.llvm.org/D147514
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