K2: add & fix tests for JVM BE diagnostics

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classFunctionOverriddenByProperty.kt

@@ -1,3 +1,5 @@
+// IGNORE_FIR
+
 open class B {
     fun getX() = 1
 }

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/delegatedFunctionOverriddenByProperty_ir.kt

@@ -1,3 +1,4 @@
+// IGNORE_FIR
 // TARGET_BACKEND: JVM_IR
 interface B {
     fun getX() = 1

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/overridesNothing_old.kt

@@ -1,8 +0,0 @@
-// TARGET_BACKEND: JVM_IR
-interface B {
-    fun getX() = 1
-}
-
-class C : B {
-    <!ACCIDENTAL_OVERRIDE!><!NOTHING_TO_OVERRIDE!>override<!> val x<!> = 1
-}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/overridesNothing_old.txt

@@ -1,17 +0,0 @@
-package
-
-public interface B {
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open fun getX(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public final class C : B {
-    public constructor C()
-    public open val x: kotlin.Int = 1
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByPropertyNoImpl.kt

@@ -1,3 +1,5 @@
+// IGNORE_FIR
+
 interface T {
     fun getX(): Int
 }

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByProperty_ir.kt

@@ -1,3 +1,4 @@
+// IGNORE_FIR
 // TARGET_BACKEND: JVM_IR
 interface T {
     fun getX() = 1