Forbid callable references to members and extensions with empty LHS

This syntax is reserved to be likely used in the future as a shorthand for
"this::foo" where the resulting expression doesn't take the receiver as a
parameter but has "this" already bound to it

compiler/testData/codegen/boxInline/callableReference/classLevel2.2.kt

@@ -3,9 +3,9 @@ package test
 class A(val z: Int) {
     fun calc() = z
 
-    fun test() = call(A(z), ::calc)
+    fun test() = call(A(z), A::calc)
 }
 
 inline fun call(p: A, s: A.() -> Int): Int {
     return p.s()
-}
+}

compiler/testData/codegen/boxWithStdlib/callableReference/function/classMemberFromClass.kt

@@ -1,7 +1,7 @@
 class A {
     fun foo(k: Int) = k
 
-    fun result() = (::foo)(this, 111)
+    fun result() = (A::foo)(this, 111)
 }
 
 fun box(): String {

compiler/testData/codegen/boxWithStdlib/callableReference/function/classMemberFromExtension.kt

@@ -3,7 +3,7 @@ class A {
     fun k(k: Int) = k
 }
 
-fun A.foo() = (::o)(this) + (A::k)(this, 222)
+fun A.foo() = (A::o)(this) + (A::k)(this, 222)
 
 fun box(): String {
     val result = A().foo()

compiler/testData/codegen/boxWithStdlib/callableReference/function/extensionFromClass.kt

@@ -1,5 +1,5 @@
 class A {
-    fun result() = (::foo)(this, "OK")
+    fun result() = (A::foo)(this, "OK")
 }
 
 fun A.foo(x: String) = x

compiler/testData/codegen/boxWithStdlib/callableReference/function/innerConstructorFromClass.kt

@@ -4,7 +4,7 @@ class A {
         val k = 222
     }
     
-    fun result() = (A::Inner)(this).o + (::Inner)(this).k
+    fun result() = (A::Inner)(this).o + (A::Inner)(this).k
 }
 
 fun box(): String {

compiler/testData/codegen/boxWithStdlib/callableReference/function/innerConstructorFromExtension.kt

@@ -5,7 +5,7 @@ class A {
     }
 }
 
-fun A.foo() = (A::Inner)(this).o + (::Inner)(this).k
+fun A.foo() = (A::Inner)(this).o + (A::Inner)(this).k
 
 fun box(): String {
     val result = A().foo()

compiler/testData/codegen/boxWithStdlib/callableReference/function/privateClassMember.kt

@@ -1,7 +1,7 @@
 class A {
     private fun foo() = "OK"
 
-    fun bar() = (::foo)(this)
+    fun bar() = (A::foo)(this)
 }
 
 fun box() = A().bar()

compiler/testData/codegen/boxWithStdlib/callableReference/function/traitImplMethodWithClassReceiver.kt

@@ -4,7 +4,7 @@ interface T {
 
 class B : T {
     inner class C {
-        fun bar() = (::foo)(this@B)
+        fun bar() = (T::foo)(this@B)
     }
 }
 

compiler/testData/codegen/boxWithStdlib/callableReference/property/kt6870_privatePropertyReference.kt

@@ -4,8 +4,8 @@ class Test {
     public fun exec() {
         val t = object : Thread() {
             override fun run() {
-                ::iv.get(this@Test)
-                ::iv.set(this@Test, 2)
+                Test::iv.get(this@Test)
+                Test::iv.set(this@Test, 2)
             }
         }
         t.start()

compiler/testData/codegen/boxWithStdlib/reflection/properties/privateToThisAccessors.kt

@@ -1,3 +1,4 @@
+import kotlin.reflect.*
 import kotlin.reflect.jvm.*
 
 class K<in T : String> {
@@ -6,10 +7,10 @@ class K<in T : String> {
         set(value) {}
 
     fun run(): String {
-        val p = ::t
+        val p = K::class.memberProperties.single() as KMutableProperty1<K<String>, String>
         p.isAccessible = true
-        p.set(this, "" as T)
-        return p.get(this)
+        p.set(this as K<String>, "")
+        return p.get(this) as String
     }
 }