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In https://reviews.llvm.org/D146917, MLIR's LIT configuration was updated to allow us to use `mlir-cpu-runner` to run Arm SVE integration tests. That update broke the following buildbot that doesn't support SVE: https://lab.llvm.org/buildbot/#/builders/179/builds/6704 While that bot doesn't support SVE, it can run SVE tests under emulation. This patch makes sure that whenever an Arm emulator is set (via `RM_EMULATOR_EXECUTABLE` CMake variable), it is used to run both `lli` _and_ `mlir-cpu-runner`. I am sending this without a review as it's a rather trivial change and I want to quickly fix the spurious bot failure.
Multi-Level Intermediate Representation
See https://mlir.llvm.org/ for more information.