K2: report JVM backend errors in the same way in PSI as LT

Do not try to find PSI element, but always use the IR element offsets
instead. This greatly simplifies test data because we don't need to have
custom PSI- and LT- based diagnostic ranges in every test, and K1/K2
behavior also is mostly the same.

The exact offset ranges are not as important for backend diagnostics, so
it's better to have K2+PSI and K2+LT behaving the same.

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/defaultVsNonDefault.fir.kt

@@ -1,12 +0,0 @@
-// COMPARE_WITH_LIGHT_TREE
-
-interface Base1 {
-    fun getX(): Int
-}
-
-interface Base2 {
-    val x: Int
-        get() = 1
-}
-
-<!CONFLICTING_INHERITED_JVM_DECLARATIONS{LT}!>interface <!CONFLICTING_INHERITED_JVM_DECLARATIONS{PSI}!>Test<!> : Base1, Base2<!>

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/defaultVsNonDefault.kt

@@ -1,4 +1,4 @@
-// COMPARE_WITH_LIGHT_TREE
+// FIR_IDENTICAL
 
 interface Base1 {
     fun getX(): Int
@@ -9,4 +9,4 @@ interface Base2 {
         get() = 1
 }
 
-interface <!CONFLICTING_INHERITED_JVM_DECLARATIONS!>Test<!> : Base1, Base2
+<!CONFLICTING_INHERITED_JVM_DECLARATIONS!>interface Test : Base1, Base2<!>

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/kt43611.fir.kt

@@ -1,9 +1,8 @@
-// COMPARE_WITH_LIGHT_TREE
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
 interface A {
-    <!CONFLICTING_JVM_DECLARATIONS{LT}!><!CONFLICTING_JVM_DECLARATIONS{PSI}!>fun f(a: List<Int>): String<!> = TODO()<!>
-    <!CONFLICTING_JVM_DECLARATIONS{LT}!><!CONFLICTING_JVM_DECLARATIONS{PSI}!>private fun f(a: List<String>): String<!> = TODO()<!>
+    <!CONFLICTING_JVM_DECLARATIONS!>fun f(a: List<Int>): String = TODO()<!>
+    <!CONFLICTING_JVM_DECLARATIONS!>private fun f(a: List<String>): String = TODO()<!>
 }
 
 class B : A

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/kt43611.kt

@@ -1,9 +1,8 @@
-// COMPARE_WITH_LIGHT_TREE
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
 interface A {
-    <!CONFLICTING_JVM_DECLARATIONS!>fun f(a: List<Int>): String<!> = TODO()
-    <!CONFLICTING_JVM_DECLARATIONS!>private fun f(a: List<String>): String<!> = TODO()
+    <!CONFLICTING_JVM_DECLARATIONS!>fun f(a: List<Int>): String = TODO()<!>
+    private <!CONFLICTING_JVM_DECLARATIONS!>fun f(a: List<String>): String = TODO()<!>
 }
 
 class B : A

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/oneTrait.fir.kt

@@ -1,9 +0,0 @@
-// COMPARE_WITH_LIGHT_TREE
-
-interface T {
-    fun getX() = 1
-}
-
-class C : T {
-    <!ACCIDENTAL_OVERRIDE{LT}!><!ACCIDENTAL_OVERRIDE{PSI}!>val x<!> = 1<!>
-}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/oneTrait.kt

@@ -1,9 +1,9 @@
-// COMPARE_WITH_LIGHT_TREE
+// FIR_IDENTICAL
 
 interface T {
     fun getX() = 1
 }
 
 class C : T {
-    <!ACCIDENTAL_OVERRIDE!>val x<!> = 1
+    <!ACCIDENTAL_OVERRIDE!>val x = 1<!>
 }

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/traitFunctionOverriddenByPropertyInTrait.fir.kt

@@ -1,10 +1,8 @@
-// COMPARE_WITH_LIGHT_TREE
-
 interface T {
     fun getX() = 1
 }
 
 interface C : T {
-    <!ACCIDENTAL_OVERRIDE{LT}!><!ACCIDENTAL_OVERRIDE{PSI}!>val x: Int<!>
+    <!ACCIDENTAL_OVERRIDE!>val x: Int
         get() = 1<!>
 }

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/traitFunctionOverriddenByPropertyInTrait.kt

@@ -1,10 +1,8 @@
-// COMPARE_WITH_LIGHT_TREE
-
 interface T {
     fun getX() = 1
 }
 
 interface C : T {
     val x: Int
-        <!ACCIDENTAL_OVERRIDE!>get()<!> = 1
+        <!ACCIDENTAL_OVERRIDE!>get() = 1<!>
 }

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/traitPropertyOverriddenByFunctionInTrait.fir.kt

@@ -1,10 +0,0 @@
-// COMPARE_WITH_LIGHT_TREE
-
-interface T {
-    val x: Int
-        get() = 1
-}
-
-interface C : T {
-    <!ACCIDENTAL_OVERRIDE{LT}!><!ACCIDENTAL_OVERRIDE{PSI}!>fun getX()<!> = 1<!>
-}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/traitPropertyOverriddenByFunctionInTrait.kt

@@ -1,4 +1,4 @@
-// COMPARE_WITH_LIGHT_TREE
+// FIR_IDENTICAL
 
 interface T {
     val x: Int
@@ -6,5 +6,5 @@ interface T {
 }
 
 interface C : T {
-    <!ACCIDENTAL_OVERRIDE!>fun getX()<!> = 1
+    <!ACCIDENTAL_OVERRIDE!>fun getX() = 1<!>
 }

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/twoTraits.fir.kt

@@ -1,13 +0,0 @@
-// COMPARE_WITH_LIGHT_TREE
-
-interface T1 {
-    fun getX() = 1
-}
-
-interface T2 {
-    val x: Int
-        get() = 1
-}
-
-<!CONFLICTING_INHERITED_JVM_DECLARATIONS{LT}!>class <!CONFLICTING_INHERITED_JVM_DECLARATIONS{PSI}!>C<!> : T1, T2 {
-}<!>

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/twoTraits.kt

@@ -1,4 +1,4 @@
-// COMPARE_WITH_LIGHT_TREE
+// FIR_IDENTICAL
 
 interface T1 {
     fun getX() = 1
@@ -9,5 +9,5 @@ interface T2 {
         get() = 1
 }
 
-class <!CONFLICTING_INHERITED_JVM_DECLARATIONS!>C<!> : T1, T2 {
-}
+<!CONFLICTING_INHERITED_JVM_DECLARATIONS!>class C : T1, T2 {
+}<!>