[OMPIRBuilder] Don't outline DISTRIBUTE on CPUs (#158317) We use different OpenMP runtime functions on CPU and target offload. The one used for DISTRIBUTE on target offload needs a function pointer to an offloaded function, but the one on CPU doesn't. This caused unnessecary overhead on CPUs because SHARED or FIRSTPRIVATE memory from the surrounding context has to be packaged into a context structure just for an ordinary function call (which would hopefully eventually get inlined). This also makes the IR harder to read.
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