This is an experimental address space for strided buffers. These buffers
can have structs as elements and
a stride > 1.
These pointers allow the indexed access in units of stride, i.e., they
point at `buffer[index * stride]`.
Thus, we can use the `idxen` modifier for buffer loads.
We assign address space 9 to 192-bit buffer pointers which contain a
128-bit descriptor, a 32-bit offset and a 32-bit index. Essentially,
they are fat buffer pointers with an additional 32-bit index.
OpenCL loses fast math information by going through libcall wrappers
around intrinsics.
Do this to preserve call site flags which are lost when inlining. It's
not safe in general to propagate flags during inline, so avoid dealing
with this by just special casing some of the useful calls.
