A few new OpenGLES3.0 builtin
function are implemented here:
- sinh, cosh, tanh, arcsinh,
  arccosh, arctanh
- floatBitsToInt, floatBitsToUInt,
  intBitsToFloat, uintBitsToFloat
- round

Change-Id: Ic0edcd80dff2bdded6cd6dccf1e5d4df64c5d8ba
Reviewed-on: https://swiftshader-review.googlesource.com/2862Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>