[JS IR BE] Fixup property accessors

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PrivateMembersLowering.kt

@@ -154,6 +154,14 @@ class PrivateMembersLowering(val context: JsIrBackendContext) : ClassLoweringPas
             }
         }
 
+        // Detach old function from corresponding property
+        val correspondingProperty = function.correspondingPropertySymbol?.owner
+        if (correspondingProperty != null) {
+            when (function) {
+                correspondingProperty.getter -> correspondingProperty.getter = staticFunction
+                correspondingProperty.setter -> correspondingProperty.setter = staticFunction
+            }
+        }
 
         staticFunction.typeParameters += function.typeParameters.map { it.deepCopyWithSymbols(staticFunction) }
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ThrowableSuccessorsLowering.kt

@@ -200,6 +200,7 @@ class ThrowableSuccessorsLowering(val context: JsIrBackendContext) : FileLowerin
             val function = JsIrBuilder.buildFunction(name, fakeAccessor.returnType, fakeAccessor.parent).apply {
                 overriddenSymbols += fakeAccessor.overriddenSymbols
                 correspondingPropertySymbol = fakeAccessor.correspondingPropertySymbol
+                correspondingPropertySymbol!!.owner.getter = this
                 dispatchReceiverParameter = fakeAccessor.dispatchReceiverParameter?.copyTo(this)
             }