[clang] [clang] Return larger CXX records in memory (PR #120670)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Missing regression test in clang/test/CodeGen.

We probably want a release note for this (clang/docs/ReleaseNotes.rst).

(If you're interested, there's another x86-64 ABI bug which nobody got around to fixing: #76017.)

https://github.com/llvm/llvm-project/pull/120670