[clang] [CIR] Upstream initial support for complete record types (PR #135844)

[Andy Kaylor via cfe-commits]

andykaylor wrote:

> Still OK, see the request on line 46 of CIRGenRecordLayoutBuilder.cpp for the comment request previously mentioned.

Thanks. I missed that somehow.

https://github.com/llvm/llvm-project/pull/135844