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

[Andy Kaylor via cfe-commits]

================
@@ -1148,6 +1146,35 @@ mlir::Value CIRGenFunction::emitAlloca(StringRef name, mlir::Type ty,
   return addr;
 }
 
+// Note: this function also emit constructor calls to support a MSVC extensions
+// allowing explicit constructor function call.
+RValue CIRGenFunction::emitCXXMemberCallExpr(const CXXMemberCallExpr *ce,
+                                             ReturnValueSlot returnValue) {
+  const Expr *callee = ce->getCallee()->IgnoreParens();
+
+  if (isa<BinaryOperator>(callee)) {
+    cgm.errorNYI(ce->getSourceRange(),
+                 "emitCXXMemberCallExpr: C++ binary operator");
+    return RValue::get(nullptr);
+  }
+
+  const auto *me = cast<MemberExpr>(callee);
+  const auto *md = cast<CXXMethodDecl>(me->getMemberDecl());
+
+  if (md->isStatic()) {
+    cgm.errorNYI(ce->getSourceRange(), "emitCXXMemberCallExpr: static method");
+    return RValue::get(nullptr);
+  }
----------------
andykaylor wrote:

This is marked NYI in the incubator. The classic codegen only has a couple of lines of code here to handle it, but I'd prefer to leave it for a later PR so I can properly investigate why the incubator didn't implement it.

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