Add JMH benchmarks for int4Bit and int4Dibit dot products#16170
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This PR adds JMH benchmarks for
int4BitDotProductandint4DibitDotProduct, mirroring the existingbinaryDotProductUint8Scalar/Vectorpattern (scalar benchmark + vector@Forkwith--add-modules=jdk.incubator.vector).These BBQ scoring kernels previously had no JMH coverage despite having dedicated Panama implementations.