ciflow/mps/198689: Make IS_APPLE_M1 a plain bool so skipMPSIf honors it

发生了什么

#198689 added IS_APPLE_M1 as a LazyVal and gated test_grid_sample_large_index_{2d,3d} with @skipMPSIf(MACOS_VERSION . skipIf only skips when its condition is a str or an actual bool . On macOS 14 the expression short-circuits to True , but on macOS 15 or returns the LazyVal object itself, which is truthy yet not a bool , so the skip is silently ignored and both tests still fail with Invalid buffer size: 8.00 GiB on…

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