[Libclc-dev] [PATCH] math: Add erf ported from amd-builtins

[Vedran Miletić via Libclc-dev]

The port is straight from amd-builtins, analogous to erfc. Just like in
sinpi, the 32-bit float variant had optional code relying on subnormals
which was removed during porting.

Hope this can be merged.

Regards,
Vedran
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