Performance fix: don't let boost promote doubles to long doubles #968
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Set boost options in CMakeLists.txt to not promote doubles to long doubles. Promotion
incurs performance penalty on all platforms, and particularly aarch64.
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Fixes #966
This fix resolves performance issue where Boost::math unnecessarily promotes doubles to long double, which is not fully supported by hardware leading to slow-downs.
The change is to set a define during cmake process which prevents promotion ( -DBOOST_MATH_PROMOTE_DOUBLE_POLICY=false )