[clang] [clang][dataflow] Handle when `this` refers to a different location (PR #146900)

[Jan Voung via cfe-commits]

jvoung wrote:

> Good idea, okay, posted a question in the Clang Frontend section https://discourse.llvm.org/t/rules-for-overriding-what-this-refers-to-in-the-ast-e-g-if-under-an-initlistexpr/87372 -- thanks!

Sorry for the delay! We did get one reply saying they came up with a similar answer in a patch for [clang][bytecode], and I see yronglin pinged a few other folks to see if there are additional comments.

https://github.com/llvm/llvm-project/pull/146900