[clang] [clang] remove non-functional SrcAddr parameter from performAddrSpaceCast (PR #179330)

[Matt Arsenault via cfe-commits]

arsenm wrote:

IMO every time LLVM guesses at one of these "just in case there's some target that needs this" controls it's useless. Without a concrete use case, the interface never works out right. It's not a good idea to leave something on the off chance some out of tree target might want it 

https://github.com/llvm/llvm-project/pull/179330