[clang] [clang] Handle trivial_abi attribute for Microsoft ABI. (PR #88857)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

What is left to tackle so this can be merged? (I ran into this via looking at https://github.com/llvm/llvm-project/issues/87993)

https://github.com/llvm/llvm-project/pull/88857