[clang][bytecode] Fix a std::optional<bool> mishap (llvm#167091)

This is about the value saved in the std::optional, not about whether
the optional has a value at all.

Author: tbaederr

clang/lib/AST/ByteCode/Compiler.cpp

@@ -2508,7 +2508,7 @@ bool Compiler<Emitter>::VisitAbstractConditionalOperator(
   };
 
   if (std::optional<bool> BoolValue = getBoolValue(Condition)) {
-    if (BoolValue)
+    if (*BoolValue)
       return visitChildExpr(TrueExpr);
     return visitChildExpr(FalseExpr);
   }