[FIR] Add JVM diagnostics about external declaration

compiler/testData/diagnostics/testsWithStdLib/native/abstract.fir.kt

@@ -1,11 +0,0 @@
-import kotlin.jvm.*
-
-abstract class C {
-    abstract external fun foo()
-}
-
-fun test() {
-    abstract class Local {
-        abstract external fun foo()
-    }
-}

compiler/testData/diagnostics/testsWithStdLib/native/abstract.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 import kotlin.jvm.*
 
 abstract class C {

compiler/testData/diagnostics/testsWithStdLib/native/body.fir.kt

@@ -1,25 +0,0 @@
-import kotlin.jvm.*
-
-external fun foo() {}
-
-class C {
-    external fun foo() {}
-
-    companion object {
-        external fun foo() {}
-    }
-}
-
-object O {
-    external fun foo() {}
-}
-
-fun test() {
-    class Local {
-        external fun foo() {}
-    }
-
-    object {
-        external fun foo() {}
-    }
-}

compiler/testData/diagnostics/testsWithStdLib/native/body.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 import kotlin.jvm.*
 
 <!EXTERNAL_DECLARATION_CANNOT_HAVE_BODY!>external fun foo()<!> {}

compiler/testData/diagnostics/testsWithStdLib/native/inline.fir.kt

@@ -1,11 +0,0 @@
-import kotlin.jvm.*
-
-abstract class C {
-    <!NOTHING_TO_INLINE!>inline<!> external fun foo()
-}
-
-fun test() {
-    abstract class Local {
-        <!NOTHING_TO_INLINE!>inline<!> external fun foo()
-    }
-}

compiler/testData/diagnostics/testsWithStdLib/native/inline.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 import kotlin.jvm.*
 
 abstract class C {

compiler/testData/diagnostics/testsWithStdLib/native/reified.fir.kt

@@ -1,4 +0,0 @@
-import kotlin.jvm.*
-
-external fun <<!REIFIED_TYPE_PARAMETER_NO_INLINE!>reified<!> T> foo()
-inline external fun <reified T> bar()

compiler/testData/diagnostics/testsWithStdLib/native/reified.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 import kotlin.jvm.*
 
 external fun <<!REIFIED_TYPE_PARAMETER_NO_INLINE!>reified<!> T> foo()

compiler/testData/diagnostics/testsWithStdLib/native/trait.fir.kt

@@ -1,11 +0,0 @@
-import kotlin.jvm.*
-
-interface Tr {
-    external fun foo()
-    external fun bar() {}
-
-    companion object {
-        external fun foo()
-        external fun bar() {}
-    }
-}

compiler/testData/diagnostics/testsWithStdLib/native/trait.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 import kotlin.jvm.*
 
 interface Tr {