[Sema] NFC. Simplify code in a few places of TryOrBuildParenListInitialization

Author: ilya-biryukov

clang/lib/Sema/SemaInit.cpp

@@ -25,6 +25,7 @@
 #include "clang/Sema/EnterExpressionEvaluationContext.h"
 #include "clang/Sema/Initialization.h"
 #include "clang/Sema/Lookup.h"
+#include "clang/Sema/Ownership.h"
 #include "clang/Sema/SemaInternal.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/FoldingSet.h"
@@ -5429,18 +5430,12 @@ static void TryOrBuildParenListInitialization(
   auto HandleInitializedEntity = [&](const InitializedEntity &SubEntity,
                                      const InitializationKind &SubKind,
                                      Expr *Arg, Expr **InitExpr = nullptr) {
-    InitializationSequence IS = [&]() {
-      if (Arg)
-        return InitializationSequence(S, SubEntity, SubKind, Arg);
-      return InitializationSequence(S, SubEntity, SubKind, std::nullopt);
-    }();
+    InitializationSequence IS = InitializationSequence(
+        S, SubEntity, SubKind, Arg ? MultiExprArg(Arg) : std::nullopt);
 
     if (IS.Failed()) {
       if (!VerifyOnly) {
-        if (Arg)
-          IS.Diagnose(S, SubEntity, SubKind, Arg);
-        else
-          IS.Diagnose(S, SubEntity, SubKind, std::nullopt);
+        IS.Diagnose(S, SubEntity, SubKind, Arg ? ArrayRef(Arg) : std::nullopt);
       } else {
         Sequence.SetFailed(
             InitializationSequence::FK_ParenthesizedListInitFailed);
@@ -5450,10 +5445,8 @@ static void TryOrBuildParenListInitialization(
     }
     if (!VerifyOnly) {
       ExprResult ER;
-      if (Arg)
-        ER = IS.Perform(S, SubEntity, SubKind, Arg);
-      else
-        ER = IS.Perform(S, SubEntity, SubKind, std::nullopt);
+      ER = IS.Perform(S, SubEntity, SubKind,
+                      Arg ? MultiExprArg(Arg) : std::nullopt);
       if (InitExpr)
         *InitExpr = ER.get();
       else