[clang] Fix/172072 auto function param (PR #172092)

[Priyanshu Singh via cfe-commits]

dev-priyanshu15 wrote:

Thanks @Serafean and @clementval. I've removed the Flang changes and updated the fix using your approach from CXType.cpp. The improved commit has been force-pushed.

https://github.com/llvm/llvm-project/pull/172092