[LIR] Fix incorrect return type in invoke-polymorphic

Bug: b/225838009
Change-Id: I94b03d71af28556c9493b106d7355db061fe8997

src/main/java/com/android/tools/r8/lightir/Lir2IRConverter.java

diff --git a/src/main/java/com/android/tools/r8/lightir/Lir2IRConverter.java b/src/main/java/com/android/tools/r8/lightir/Lir2IRConverter.java
index 919df25..985b5c2 100644
--- a/src/main/java/com/android/tools/r8/lightir/Lir2IRConverter.java
+++ b/src/main/java/com/android/tools/r8/lightir/Lir2IRConverter.java
@@ -656,7 +656,7 @@
 
     @Override
     public void onInvokePolymorphic(DexMethod target, DexProto proto, List<EV> arguments) {
-      Value dest = getInvokeInstructionOutputValue(target);
+      Value dest = getInvokeInstructionOutputValue(proto);
       List<Value> ssaArgumentValues = getValues(arguments);
       InvokePolymorphic instruction = new InvokePolymorphic(target, proto, dest, ssaArgumentValues);
       addInstruction(instruction);