[FIR] Add checking receivers of callable references

compiler/testData/diagnostics/tests/callableReference/bound/expressionWithNullableType.fir.kt

@@ -6,10 +6,10 @@ public interface J {
 
 // FILE: test.kt
 
-fun f1(x: Int?): Any = x::hashCode
+fun f1(x: Int?): Any = <!UNRESOLVED_REFERENCE!>x::hashCode<!>
 fun <T> f2(t: T): Any = t::hashCode
 fun <S : String?> f3(s: S): Any = s::hashCode
-fun <U : Any> f4(u: U?): Any = u::hashCode
-fun f5(c: List<*>): Any = c[0]::hashCode
+fun <U : Any> f4(u: U?): Any = <!UNRESOLVED_REFERENCE!>u::hashCode<!>
+fun f5(c: List<*>): Any = <!UNRESOLVED_REFERENCE!>c[0]::hashCode<!>
 
 fun f6(j: J): Any = j.platformString()::hashCode

compiler/testData/diagnostics/tests/callableReference/bound/reservedExpressionSyntax.fir.kt

@@ -18,9 +18,9 @@ class Test {
     val <T> List<T>.b: Int? get() = size
 
     fun <T> List<T>.testCallable1(): () -> Unit = a<T>::foo
-    fun <T> List<T>.testCallable2(): () -> Unit = b?::foo
-    fun <T> List<T>.testCallable3(): () -> Unit = b<T, Any>::foo
-    fun <T> List<T>.testCallable4(): () -> Unit = b<T>?::foo
+    fun <T> List<T>.testCallable2(): () -> Unit = <!UNRESOLVED_REFERENCE!>b?::foo<!>
+    fun <T> List<T>.testCallable3(): () -> Unit = <!UNRESOLVED_REFERENCE!>b<T, Any>::foo<!>
+    fun <T> List<T>.testCallable4(): () -> Unit = <!UNRESOLVED_REFERENCE!>b<T>?::foo<!>
 
     fun <T> List<T>.testClassLiteral1() = a<T>::class
     fun <T> List<T>.testClassLiteral2() = b?::class

compiler/testData/diagnostics/tests/callableReference/bound/reservedExpressionSyntax2.fir.kt

@@ -4,4 +4,4 @@ package test
 fun nullableFun(): Int? = null
 fun Int.foo() {}
 
-val test1 = nullableFun()?::foo
+val test1 = <!UNRESOLVED_REFERENCE!>nullableFun()?::foo<!>