[FIR] Drop ImplicitReceiverValue.expandedType

This field cached expansion of type of implicit receiver, which is incorrect,
  because type of receiver may change because of smartcasts, but this field
  was immutable

compiler/fir/providers/src/org/jetbrains/kotlin/fir/resolve/calls/FirReceivers.kt

@@ -97,7 +97,7 @@ open class ExpressionReceiverValue(
 sealed class ImplicitReceiverValue<S : FirBasedSymbol<*>>(
     val boundSymbol: S,
     type: ConeKotlinType,
-    protected val useSiteSession: FirSession,
+    val useSiteSession: FirSession,
     protected val scopeSession: ScopeSession,
     private val mutable: Boolean,
     val contextReceiverNumber: Int = -1,
@@ -110,8 +110,6 @@ sealed class ImplicitReceiverValue<S : FirBasedSymbol<*>>(
 
     val originalType: ConeKotlinType = type
 
-    val expandedType: ConeKotlinType = type.applyIf(type is ConeClassLikeType) { fullyExpandedType(useSiteSession) }
-
     var implicitScope: FirTypeScope? =
         type.scope(
             useSiteSession,

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/declarations/ImplicitReceiverUtils.kt

@@ -276,7 +276,7 @@ class FirTowerDataElement(
     }
 
     private fun ImplicitReceiverValue<*>.getImplicitScope(): FirScope {
-        return when (expandedType) {
+        return when (type.fullyExpandedType(useSiteSession)) {
             is ConeErrorType,
             is ConeStubType -> FirTypeScope.Empty
             else -> implicitScope ?: error("Scope for type ${type::class.simpleName} is null.")