[clang] [Cygwin] Reduced number of inline elements of CallArgList. (PR #74977)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Adding workarounds to LLVM for host compiler bugs is something we do from time to time, but any such workarounds need to be clearly documented in the source code, and as narrowly targeted as possible (for example, under an `#ifdef __CYGWIN__`).

Since this is an issue with the latest version of gcc, please also report it to the gcc bugtracker.

https://github.com/llvm/llvm-project/pull/74977