[FIR] Move reference-related utils from :fir:tree to :fir:semantics

This is needed to gain access to providers functionality in those
  utilities, which is important for support of FirDeserializedEnumAccessExpression
  node (see later commits)

^KT-64975

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/expressions/ReferenceUtils.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.expressions
+
+import org.jetbrains.kotlin.fir.FirElement
+import org.jetbrains.kotlin.fir.references.FirReference
+import org.jetbrains.kotlin.fir.references.FirResolvedNamedReference
+import org.jetbrains.kotlin.fir.references.resolved
+import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
+
+fun FirExpression.toResolvedCallableReference(): FirResolvedNamedReference? {
+    return toReference()?.resolved
+}
+
+fun FirExpression.toReference(): FirReference? {
+    return when (this) {
+        is FirWrappedArgumentExpression -> expression.toResolvedCallableReference()
+        is FirSmartCastExpression -> originalExpression.toReference()
+        is FirDesugaredAssignmentValueReferenceExpression -> expressionRef.value.toReference()
+        is FirResolvable -> calleeReference
+        else -> null
+    }
+}
+
+fun FirExpression.toResolvedCallableSymbol(): FirCallableSymbol<*>? {
+    return toResolvedCallableReference()?.resolvedSymbol as? FirCallableSymbol<*>?
+}
+
+val FirElement.calleeReference: FirReference?
+    get() = (this as? FirResolvable)?.calleeReference ?: (this as? FirVariableAssignment)?.calleeReference
+
+val FirVariableAssignment.calleeReference: FirReference? get() = lValue.toReference()