[clang] [CIR] Upstream support for C++ member function calls (PR #140290)

[Bruno Cardoso Lopes via cfe-commits]

================
@@ -0,0 +1,45 @@
+//===----- CirGenCXXABI.cpp - Interface to C++ ABIs -----------------------===//
----------------
bcardosolopes wrote:

`CIRGenCXXABI.cpp` to match the name of the file? (Or I guess none because this isn't required anymore?)

https://github.com/llvm/llvm-project/pull/140290