backend: add double version of erf

Graphics / Beignet - rander [intel.com] - 17 April 2017 04:08 EDT

cp from fdlibm and refine it

777c55a backend: add double version of erf
backend/src/libocl/tmpl/ocl_math_common.tmpl.cl | 114 ++++++++++++++++++++++++
backend/src/libocl/tmpl/ocl_math_common.tmpl.h | 1 +
2 files changed, 115 insertions(+)

Upstream: cgit.freedesktop.org

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