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ScalarEvolution computes the closed form of a summing loop at 65 bits, which neither SPIR-V back-end accepts (#1050). The test fails until the odd-width arithmetic is legalized or avoided.
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Adds a failing test for #1050: a loop summing
1:nis replaced by its closed form, which ScalarEvolution computes ini65. The LLVM SPIR-V back-end rejects that width, and the Khronos translator crashes on it. #1027 doesn't change this, becauseBinomialCoefficientignores the datalayout's native widths.The fix still needs to be written. This PR is a draft until then.