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The methods in `SideEffectUtils.h` (and their implementations in `SideEffectUtils.cpp`) seem to have similar intent to methods already existing in `SideEffectInterfaces.h`. Move the decleration (and implementation) from `SideEffectUtils.h` (and `SideEffectUtils.cpp`) into `SideEffectInterfaces.h` (and `SideEffectInterface.cpp`). Also drop the `SideEffectInterface::hasNoEffect` method in favor of `mlir::isMemoryEffectFree` which actually recurses into the operation instead of just relying on the `hasRecursiveMemoryEffectTrait` exclusively. Differential Revision: https://reviews.llvm.org/D137857