[FIR2IR] Unset isLateinit flag for properties implemented by delegation

^KT-70417 Fixed

Author: demiurg906

compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/backend/Fir2IrFakeOverrideStrategy.kt

@@ -164,6 +164,7 @@ class Fir2IrDelegatedMembersGenerationStrategy(
                 overridableMember.updateDeclarationHeader()
                 overridableMember.getter?.updateDeclarationHeader()
                 overridableMember.setter?.updateDeclarationHeader()
+                overridableMember.isLateinit = false
             }
         }
 

compiler/testData/codegen/box/classDelegation/hiddenDelegateAndLateinitVar.jvm_abi.txt

@@ -0,0 +1,9 @@
+MODULE main
+	CLASS D.class
+		CLASS METADATA
+			PROPERTY getX()Ljava/lang/String;
+				Property: class.metadata.property.setterValueParameter
+					K1
+						<anonymous parameter 0>: kotlin/String
+					K2
+						_: kotlin/String

compiler/testData/codegen/box/classDelegation/hiddenDelegateAndLateinitVar.kt

@@ -1,5 +1,5 @@
-// IGNORE_BACKEND_K2: JVM_IR
 // ISSUE: KT-70417
+// JVM_ABI_K1_K2_DIFF: difference in name of anonymous parameter `_` of setter
 
 interface A {
     var x: String