MathUtils: extend the OpenCL sincos workaround to Metal

A reference parameter carries its address space into template deduction, so
sincos(T ang, T& s, T& c) called with thread-resident floats deduces T as float
from the first argument and as thread float from the other two. OpenCL has the
same rule, and the three-parameter overload already there for it works verbatim
on Metal.

Author: ktf

Common/MathUtils/include/MathUtils/detail/trigonometric.h

@@ -110,7 +110,7 @@ inline void bringToPMPiGen(T& phi)
   phi = toPMPiGen<T>(phi);
 }
 
-#ifdef __OPENCL__ // TODO: get rid of that stupid workaround for OpenCL template address spaces
+#if defined(__OPENCL__) || defined(__METAL__) // TODO: get rid of that stupid workaround for OpenCL template address spaces
 template <typename T, typename S, typename U>
 GPUhdi() void sincos(T ang, S& s, U& c)
 {