babelstream dot kernel verification

[mehmetyusufoglu]

Statement:
Since latest version runs the dot kernel for all backends, for single threaded backends reduce operations adds elements of long arrays. Therefore floating point errors accumulate. To prevent this, double initial value (ie 0.0) is used instead of zero of data type DataType{0.0}:

resultDot = static_cast(std::reduce(sumPtr, sumPtr + workDivDot.m_gridBlockExtent[0], 0.0));

For different backends a different verification using DataType can be used. Notice that it is run on host, independent of backend.