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For SPIR-V, only export the main function if it is actually declared. Kernel entry points will often have parameters and more than one kernel declared. In general, SPIR-V binaries should mostly be compiled as libraries and not as executables. However, this start code is required so that we can build test executables. Note that a call to isSpirV() would emit the code for that function, even though the call is at comptime. To save that function from being emitted the checks are just inlined manually.