[AMDGPU] New test for untested line in AMDGPUMarkLastScratchLoad (#185430) [This line](https://github.com/llvm/llvm-project/blob/af15474262100ade9a8fcfd05f9e05c7ba23ff8c/llvm/lib/Target/AMDGPU/AMDGPUMarkLastScratchLoad.cpp#L121) in the AMDGPU backend is uncovered by the existing test suite (checked using coverage, and by asserting that no tests in the existing test suite fails if we insert an `abort()` at this line). We propose a test that covers this line. We demonstrate the test by inserting an `abort()` at that line in commit [#3cb65cf](https://github.com/llvm/llvm-project/pull/185430/changes/3cb65cf4451b5e728fb1e4968ba78b8e83d74220). Running all tests shows that only our proposed test fails in the presence of the abort. We'll remove the abort before merging. This is the only test that fails in the presence of the abort (our new test) -- it will pass once we remove the abort: `CodeGen/AMDGPU/mark-last-scratch-load.ll`
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