[clang] [Clang][P1061] Consolidate ResolvedUnpexandedPackExpr into FunctionParmPackExpr (PR #125394)

[via cfe-commits]

cor3ntin wrote:

@ricejasonf yeah... really not a fan but i played with it an i don't see a way to meaningfully improve it. Thanks for trying though

https://github.com/llvm/llvm-project/pull/125394