[NFC][HIP] Disable device-side kernel launches for HIP (#171043) #165519 added support for launching kernels from the device side. This is only available in CUDA at the moment. We have to explicitly check whether we are compiling for HIP to guard against this path being exercised, since the CUDA and HIP languages rely on the same `CUDAIsDevice` bit to check for device side compilation, and it is not possible to disambiguate otherwise.
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