FIR checker: add diagnostics for backing fields

compiler/fir/analysis-tests/testData/resolve/cfg/propertiesAndInitBlocks.kt

@@ -11,7 +11,7 @@ var x2: Int = 1
         field = 1
     }
 
-val x3 = run {
+val x3 = <!PROPERTY_INITIALIZER_NO_BACKING_FIELD!>run {
     fun foo() {
         val c = 1 + 1
         throw Exception()
@@ -25,7 +25,7 @@ val x3 = run {
     }
 
     throw Exception()
-}
+}<!>
     get() {
         class GetterLocalClass {
             init {

compiler/fir/analysis-tests/testData/resolve/expresssions/genericDescriptor.kt

@@ -18,7 +18,7 @@ public interface ResolvedCall<D extends Descriptor> {
 
 // FILE: test.kt
 
-val Descriptor.name = "123"
+val Descriptor.name = <!EXTENSION_PROPERTY_WITH_BACKING_FIELD!>"123"<!>
 fun Descriptor.correct(): Boolean = true
 fun Descriptor.foo() {}
 

compiler/fir/analysis-tests/testData/resolve/extendedCheckers/RedundantVisibilityModifierChecker.kt

@@ -80,7 +80,7 @@ open class J {
             field = value
         }
 
-    var bar = 0
+    var bar = <!PROPERTY_INITIALIZER_NO_BACKING_FIELD!>0<!>
         get() = 3.1415926535
         set(value) {}
 }

compiler/fir/analysis-tests/testData/resolve/openInInterface.kt

@@ -8,7 +8,7 @@ interface Some {
 
     <!REDUNDANT_OPEN_IN_INTERFACE!>open<!> var xx: Int
     open var yy = <!PROPERTY_INITIALIZER_IN_INTERFACE!>1<!>
-    open var zz: Int
+    <!BACKING_FIELD_IN_INTERFACE!>open var zz: Int<!>
         set(value) {
             field = value
         }