JVM_IR: don't generate nullability annotations on synthetic declarations

Fixes KT-36993 and some other related issues.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/AnnotationCodegen.kt

@@ -277,7 +277,7 @@ abstract class AnnotationCodegen(
 
     companion object {
         private fun isInvisibleFromTheOutside(declaration: IrDeclaration?): Boolean {
-            if (declaration is IrSimpleFunction && declaration.origin.isSynthetic) {
+            if (declaration != null && declaration.origin.isSynthetic) {
                 return true
             }
             if (declaration is IrDeclarationWithVisibility) {

compiler/testData/codegen/bytecodeListing/annotations/onProperties.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +UseGetterNameForPropertyAnnotationsMethodOnJvm
-// IGNORE_BACKEND: JVM_IR
 
 import kotlin.reflect.KProperty
 

compiler/testData/codegen/bytecodeListing/companionObjectVisibility_before.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: -ProperVisibilityForCompanionObjectInstanceField
-// IGNORE_BACKEND: JVM_IR
 
 open class TestProtectedCompanionInClass {
     protected companion object

compiler/testData/codegen/bytecodeListing/coroutines/coroutineFields_ir.txt

@@ -4,7 +4,7 @@ final class Controller$multipleSuspensions$1 {
     field L$0: java.lang.Object
     field label: int
     synthetic field result: java.lang.Object
-    synthetic final @org.jetbrains.annotations.NotNull field this$0: Controller
+    synthetic final field this$0: Controller
     inner class Controller$multipleSuspensions$1
     method <init>(p0: Controller, p1: kotlin.coroutines.Continuation): void
     public final @org.jetbrains.annotations.Nullable method invokeSuspend(@org.jetbrains.annotations.NotNull p0: java.lang.Object): java.lang.Object
@@ -16,7 +16,7 @@ final class Controller$nonTailCall$1 {
     field L$0: java.lang.Object
     field label: int
     synthetic field result: java.lang.Object
-    synthetic final @org.jetbrains.annotations.NotNull field this$0: Controller
+    synthetic final field this$0: Controller
     inner class Controller$nonTailCall$1
     method <init>(p0: Controller, p1: kotlin.coroutines.Continuation): void
     public final @org.jetbrains.annotations.Nullable method invokeSuspend(@org.jetbrains.annotations.NotNull p0: java.lang.Object): java.lang.Object
@@ -36,7 +36,7 @@ public final class Controller {
 @kotlin.coroutines.jvm.internal.DebugMetadata
 @kotlin.Metadata
 final class CoroutineFieldsKt$box$1 {
-    synthetic final @org.jetbrains.annotations.NotNull field $result: kotlin.jvm.internal.Ref$ObjectRef
+    synthetic final field $result: kotlin.jvm.internal.Ref$ObjectRef
     field J$0: long
     field L$0: java.lang.Object
     field L$1: java.lang.Object

compiler/testData/codegen/bytecodeListing/coroutines/tcoContinuation_ir.txt

@@ -12,7 +12,7 @@ public interface FlowCollector {
 public final class TcoContinuationKt$collect$2$emit$1 {
     field label: int
     synthetic field result: java.lang.Object
-    synthetic final @org.jetbrains.annotations.NotNull field this$0: TcoContinuationKt$collect$2
+    synthetic final field this$0: TcoContinuationKt$collect$2
     inner class TcoContinuationKt$collect$2
     inner class TcoContinuationKt$collect$2$emit$1
     public method <init>(p0: TcoContinuationKt$collect$2, p1: kotlin.coroutines.Continuation): void
@@ -21,7 +21,7 @@ public final class TcoContinuationKt$collect$2$emit$1 {
 
 @kotlin.Metadata
 public final class TcoContinuationKt$collect$2 {
-    synthetic final @org.jetbrains.annotations.NotNull field $action: kotlin.jvm.functions.Function2
+    synthetic final field $action: kotlin.jvm.functions.Function2
     inner class TcoContinuationKt$collect$2
     inner class TcoContinuationKt$collect$2$emit$1
     public method <init>(p0: kotlin.jvm.functions.Function2): void
@@ -33,7 +33,7 @@ public final class TcoContinuationKt$collect$2 {
 public final class TcoContinuationKt$flow$1$collect$1 {
     field label: int
     synthetic field result: java.lang.Object
-    synthetic final @org.jetbrains.annotations.NotNull field this$0: TcoContinuationKt$flow$1
+    synthetic final field this$0: TcoContinuationKt$flow$1
     inner class TcoContinuationKt$flow$1
     inner class TcoContinuationKt$flow$1$collect$1
     public method <init>(p0: TcoContinuationKt$flow$1, p1: kotlin.coroutines.Continuation): void
@@ -42,7 +42,7 @@ public final class TcoContinuationKt$flow$1$collect$1 {
 
 @kotlin.Metadata
 public final class TcoContinuationKt$flow$1 {
-    synthetic final @org.jetbrains.annotations.NotNull field $block: kotlin.jvm.functions.Function2
+    synthetic final field $block: kotlin.jvm.functions.Function2
     inner class TcoContinuationKt$flow$1
     inner class TcoContinuationKt$flow$1$collect$1
     public method <init>(p0: kotlin.jvm.functions.Function2): void

compiler/testData/codegen/bytecodeListing/inlineClasses/annotationsOnHiddenConstructor_ir.txt

@@ -11,7 +11,7 @@ public final class Sealed$Derived {
 
 @kotlin.Metadata
 public final class Sealed$Inner {
-    synthetic final @org.jetbrains.annotations.NotNull field this$0: Sealed
+    synthetic final field this$0: Sealed
     private final field z2: int
     inner class Sealed$Inner
     public synthetic @Ann method <init>(p0: Sealed, p1: int, @Ann p2: int, @Ann p3: java.lang.String, p4: kotlin.jvm.internal.DefaultConstructorMarker): void
@@ -31,7 +31,7 @@ public abstract class Sealed {
 
 @kotlin.Metadata
 public final class Test$Inner {
-    synthetic final @org.jetbrains.annotations.NotNull field this$0: Test
+    synthetic final field this$0: Test
     private final field z2: int
     inner class Test$Inner
     public synthetic @Ann method <init>(p0: Test, p1: int, @Ann p2: int, @Ann p3: java.lang.String, p4: kotlin.jvm.internal.DefaultConstructorMarker): void

compiler/testData/codegen/bytecodeListing/jvmOverloadsAndParametersAnnotations.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 
 annotation class StringRes