[clang] [CIR] Upstream TernaryOp (PR #137184)

[Andy Kaylor via cfe-commits]

================
@@ -1058,6 +1058,48 @@ LogicalResult cir::BinOp::verify() {
   return mlir::success();
 }
 
+//===----------------------------------------------------------------------===//
+// TernaryOp
+//===----------------------------------------------------------------------===//
+
+/// Given the region at `index`, or the parent operation if `index` is None,
----------------
andykaylor wrote:

Should this be "the region at `point`"?

https://github.com/llvm/llvm-project/pull/137184