[FIR2IR] Create fake one-time use properties for callable reference to synthetic properies

Previously fir2ir created real IR properties some getter and setter for
  such references, which lead to the situation that there might be a
  unbound fake override for synthetic property which wasn't stored in
  declaration storage (and code in FakeOverrideGenerator was a hack
  to cover this case)
In the same time K1 creates fake property for such cases, which is stored
  in IrPropertyReference along with original get... and set... functions
  as getter and setter of reference. And in this commit K2 does the same thing

^KT-61637

compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirFunctionSymbol.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.fir.symbols.impl
 import org.jetbrains.kotlin.fir.FirLabel
 import org.jetbrains.kotlin.fir.contracts.FirResolvedContractDescription
 import org.jetbrains.kotlin.fir.declarations.*
+import org.jetbrains.kotlin.fir.declarations.synthetic.FirSyntheticProperty
 import org.jetbrains.kotlin.fir.expressions.FirDelegatedConstructorCall
 import org.jetbrains.kotlin.fir.references.FirControlFlowGraphReference
 import org.jetbrains.kotlin.fir.references.toResolvedConstructorSymbol
@@ -81,6 +82,9 @@ class FirConstructorSymbol(callableId: CallableId) : FirFunctionSymbol<FirConstr
  */
 abstract class FirSyntheticPropertySymbol(propertyId: CallableId, val getterId: CallableId) : FirPropertySymbol(propertyId) {
     abstract fun copy(): FirSyntheticPropertySymbol
+
+    val syntheticProperty: FirSyntheticProperty
+        get() = fir as FirSyntheticProperty
 }
 
 // ------------------------ unnamed ------------------------