[PATCH] D145074: [clang][RISCV] Fix ABI lowering for _Float16 for FP ABIs

[Alex Bradbury via Phabricator via cfe-commits]

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For trivial cases (`_Float16` as a standalone argument), it was previously correctly lowered to `half`. But the logic for catching cases involving structs was gated off, as at the time that logic was written the ABI for half was unclear.

This patch fixes that and adds a release note.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145074

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/CodeGen/TargetInfo.cpp
  clang/test/CodeGen/RISCV/riscv32-abi.c
  clang/test/CodeGen/RISCV/riscv64-abi.c

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