qualcomm ripple

https://github.com/qualcomm/ripple/blob/c9b3ccf800eb9282c89964baa68faa3ca9a1eebb/llvm/docs/RippleRef.rst

> Ripple is an IR-level mechanism that lets frontends describe block shapes (logical SIMD/tensor extents per processing element) and lets the backend (through the Ripple pass) specialize and vectorize scalar code based on those shapes.