K2: calculate deprecations for backing field properly

#KT-58224 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirSymbolInfoProvider.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.descriptors.annotations.KotlinTarget
 import org.jetbrains.kotlin.fir.analysis.checkers.getAllowedAnnotationTargets
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.languageVersionSettings
+import org.jetbrains.kotlin.fir.symbols.impl.FirBackingFieldSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
 import org.jetbrains.kotlin.load.java.JvmAbi
 import org.jetbrains.kotlin.name.Name
@@ -46,6 +47,9 @@ internal class KtFirSymbolInfoProvider(
                 firSymbol.getDeprecationForCallSite(apiVersion, AnnotationUseSiteTarget.PROPERTY)
                     ?: firSymbol.backingFieldSymbol?.getDeprecationForCallSite(apiVersion, AnnotationUseSiteTarget.FIELD)
             }
+            is FirBackingFieldSymbol -> {
+                firSymbol.getDeprecationForCallSite(apiVersion, AnnotationUseSiteTarget.FIELD)
+            }
             else -> {
                 firSymbol.getDeprecationForCallSite(apiVersion)
             }

analysis/analysis-api/testData/symbols/symbolByReference/accessorField.kt

@@ -1,4 +1,7 @@
 // DO_NOT_CHECK_NON_PSI_SYMBOL_RESTORE_K1
+
+import java.lang.Deprecated
+
 annotation class PropertyAnnotation
 annotation class FieldAnnotation
 annotation class GetAnnotation
@@ -10,6 +13,7 @@ annotation class ExplicitSetparamAnnotation
 
 @property:PropertyAnnotation
 @field:FieldAnnotation
+@field:Deprecated
 @get:GetAnnotation
 @set:SetAnnotation
 @setparam:SetparamAnnotation

analysis/analysis-api/testData/symbols/symbolByReference/accessorField.pretty.txt

@@ -1,2 +1,3 @@
 @FieldAnnotation
+@java.lang.Deprecated
 field

analysis/analysis-api/testData/symbols/symbolByReference/accessorField.txt

@@ -2,6 +2,8 @@ KtBackingFieldSymbol:
   annotationsList: [
     FieldAnnotation()
       psi: KtAnnotationEntry
+    java/lang/Deprecated()
+      psi: KtAnnotationEntry
   ]
   callableIdIfNonLocal: null
   contextReceivers: []
@@ -17,4 +19,4 @@ KtBackingFieldSymbol:
   symbolKind: LOCAL
   typeParameters: []
   getContainingModule: KtSourceModule "Sources of main"
-  deprecationStatus: null
+  deprecationStatus: DeprecationInfo(deprecationLevel=WARNING, propagatesToOverrides=false, message=null)

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirTypeResolveTransformer.kt

@@ -239,6 +239,12 @@ open class FirTypeResolveTransformer(
         }
     }
 
+    override fun transformBackingField(backingField: FirBackingField, data: Any?): FirStatement = whileAnalysing(session, backingField) {
+        backingField.transformAnnotations(this, data)
+        calculateDeprecations(backingField)
+        super.transformBackingField(backingField, data)
+    }
+
     override fun transformSimpleFunction(
         simpleFunction: FirSimpleFunction,
         data: Any?,