[clang] [clang] Implement dump() for MemberPointer APValues (PR #136130)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> > Can you do the JSONNodeDumper as well so the two stay somewhat in-sync?
> 
> Looks like that goes through `APValue::printPretty()`, so nothing to do for that.

Ah, good to know, thanks!

https://github.com/llvm/llvm-project/pull/136130