[PATCH] D142348: [RISCV][Docs] Document code generation for vector extension

[Luke Lau via Phabricator via llvm-commits]

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This adds a user guide that briefly overviews the vector extension, and
how the RISC-V backend generates code for it.
It is mostly based off of the original codegen RFC:
https://lists.llvm.org/pipermail/llvm-dev/2020-October/145850.html
But is updated for differences in today's implementation.
Specifically, it gives examples of how code is generated for

- Scalable vectors
- Fixed-length vectors
- Vector predication instructions


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142348

Files:
  llvm/docs/RISCV/RISCVVectorExtension.rst
  llvm/docs/UserGuides.rst

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