This CL adds support for named custom instructions in declarative builders.
To allow this, it introduces a templated `CustomInstruction` class.
This CL also splits ValueHandle which can capture only the **value** in single-valued instructions from InstructionHandle which can capture any instruction but provide no typing and sugaring to extract the potential Value*.
PiperOrigin-RevId: 237543222
This CL adds the same helper classes that exist in the AST form of EDSCs to support a basic indexing notation and emit the proper load and store operations and capture MemRefViews as function arguments.
This CL also adds a wrapper class LoopNestBuilder to allow generic rank-agnostic loops over indices.
PiperOrigin-RevId: 237113755
Nicolas Vasilache