[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,
+/// return the successor regions. These are the regions that may be selected
+/// during the flow of control. `operands` is a set of optional attributes that
+/// correspond to a constant value for each operand, or null if that operand is
+/// not a constant.
+void cir::TernaryOp::getSuccessorRegions(
+    mlir::RegionBranchPoint point, SmallVectorImpl<RegionSuccessor> &regions) {
+  // The `true` and the `false` region branch back to the parent operation.
+  if (!point.isParent()) {
+    regions.push_back(RegionSuccessor(this->getODSResults(0)));
+    return;
+  }
+
+  // If the condition isn't constant, both regions may be executed.
----------------
andykaylor wrote:

This comment seems to imply a constant check that isn't being performed.

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