splitting out check_finite tests out of test/math/old_error_handling_test.cpp
splitting out check_finite tests out of test/math/old_error_handling_test.cpp

stan-dev/stan,stan-dev/stan,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/stan,stan-dev/stan,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/stan