This enables a behavior seen on the real PSP where 0 * NaN == 0 in the
GPU (NOTE: This means the vertex transform pipeline).
However, this
doesn't touch INFs unfortunately, and we need to modify those too...
This, together with #21715, finally fixes#20204 .
The missing function is mainly used in D3D11, which can be used on
Windows for ARM64. It's not necesssary for the other backends, which is
why it used to be missing in the ARM64 vertex decoder.
Also fix a minor memory leak in AtracCtx2.
Henrik Rydgård