[clang] [CIR] Lower variadic arguments through an indirect call (PR #227477)

[Andy Kaylor via cfe-commits]

================
@@ -1168,7 +1156,7 @@ void CallConvLoweringPass::runOnOperation() {
   // cached as the next one to visit.
   SmallVector<cir::CIRCallOpInterface> indirectCalls;
   moduleOp.walk([&](cir::CIRCallOpInterface c) {
-    if (indirectCalleeType(c))
+    if (getIndirectCalleeType(c))
----------------
andykaylor wrote:

```suggestion
    if (c.isIndirect())
```

https://github.com/llvm/llvm-project/pull/227477