[MLIR][NVVM] Refactor tests in nvvmir.mlir (#119731) * Move the negative tests from nvvmir.mlir to nvvm-invalid.mlir. With this, all the error-handling tests are moved to the nvvm-invalid.mlir file. * Move the tma_prefetch tests to a separate file, as there are many tests, and fix the FileCheck prefix for these. * Since undef is discouraged, we use an 'i64 0' as the placeholder value for cache-hint when unused. Signed-off-by: Durgadoss R <durgadossr@nvidia.com>
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