[ASan] [Windows] Fix a new test in mingw mode The new test case added in 781719778003ca298ca57e486ab629b7f384844b didn't work in mingw mode; defines set through `/D` only works when using the clang-cl compiler driver, not the regular clang compiler driver. Switch this to use `-D`, which works with both plain clang and clang-cl, so we don't need to use a lit macro for expanding the right option to use.
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