JVM IR: generate 'main' wrappers as non-final

To replicate bytecode generated by the old backend, and thus simplify
ABI comparison.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/MainMethodGenerationLowering.kt

@@ -124,8 +124,8 @@ private class MainMethodGenerationLowering(private val context: JvmBackendContex
             name = Name.identifier("main")
             visibility = DescriptorVisibilities.PUBLIC
             returnType = context.irBuiltIns.unitType
-            modality = Modality.FINAL
-            this.origin = JvmLoweredDeclarationOrigin.GENERATED_EXTENDED_MAIN
+            modality = Modality.OPEN
+            origin = JvmLoweredDeclarationOrigin.GENERATED_EXTENDED_MAIN
         }.apply {
             val args = addValueParameter {
                 name = Name.identifier("args")

compiler/testData/codegen/bytecodeListing/main/multifileSuspend_ir.txt

@@ -2,7 +2,7 @@
 public final class Hello/Foo {
     // source: 'multifileSuspend.kt'
     public final static @org.jetbrains.annotations.Nullable method main(@org.jetbrains.annotations.NotNull p0: java.lang.String[], @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
-    public synthetic final static method main(p0: java.lang.String[]): void
+    public synthetic static method main(p0: java.lang.String[]): void
 }
 
 @kotlin.Metadata
@@ -21,5 +21,5 @@ synthetic final class Hello/Foo__MultifileSuspendKt {
     // source: 'multifileSuspend.kt'
     inner (anonymous) class Hello/Foo__MultifileSuspendKt$main$2
     public final static @org.jetbrains.annotations.Nullable method main(@org.jetbrains.annotations.NotNull p0: java.lang.String[], @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
-    public synthetic final static method main(p0: java.lang.String[]): void
+    public synthetic static method main(p0: java.lang.String[]): void
 }

compiler/testData/codegen/bytecodeListing/main/parameterlessMain_ir.txt

@@ -1,6 +0,0 @@
-@kotlin.Metadata
-public final class ParameterlessMainKt {
-    // source: 'parameterlessMain.kt'
-    public final static method main(): void
-    public synthetic final static method main(p0: java.lang.String[]): void
-}

compiler/testData/codegen/bytecodeListing/main/suspendMain_ir.txt

@@ -14,5 +14,5 @@ public final class SuspendMainKt {
     // source: 'suspendMain.kt'
     inner (anonymous) class SuspendMainKt$main$2
     public final static @org.jetbrains.annotations.Nullable method main(@org.jetbrains.annotations.NotNull p0: java.lang.String[], @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
-    public synthetic final static method main(p0: java.lang.String[]): void
+    public synthetic static method main(p0: java.lang.String[]): void
 }