[clang] [CIR] Upstream lowering of conditional operators to TernaryOp (PR #138156)

[Erich Keane via cfe-commits]

================
@@ -948,6 +950,165 @@ void CIRGenFunction::emitIgnoredExpr(const Expr *e) {
   emitLValue(e);
 }
 
+// Handle the case where the condition is a constant evaluatable simple integer,
+// which means we don't have to separately handle the true/false blocks.
+static std::optional<LValue> handleConditionalOperatorLValueSimpleCase(
+    CIRGenFunction &cgf, const AbstractConditionalOperator *e) {
+  const Expr *condExpr = e->getCond();
+  bool condExprBool;
----------------
erichkeane wrote:

```suggestion
  bool condExprBool = false;
```

I realize this gets initialized by the call to `constantFoldsToSimpleInteger`, but this is a bit of a 'defensive' programming here.

https://github.com/llvm/llvm-project/pull/138156