Refactoring & clarification: implement new FIR tower resolver

compiler/testData/diagnostics/tests/scopes/inheritance/companionObject.fir.kt

@@ -24,7 +24,7 @@ class C: B(), A {
         C.<!UNRESOLVED_REFERENCE!>foo<!>()
 
         <!UNRESOLVED_REFERENCE!>A_<!>()
-        A.A_()
+        A.<!UNRESOLVED_REFERENCE!>A_<!>()
         A.Companion.A_()
         C.<!UNRESOLVED_REFERENCE!>A_<!>()
 
@@ -34,7 +34,7 @@ class C: B(), A {
         C.<!UNRESOLVED_REFERENCE!>bar<!>()
 
         B_()
-        B.B_()
+        B.<!UNRESOLVED_REFERENCE!>B_<!>()
         B.Companion.B_()
         C.<!UNRESOLVED_REFERENCE!>B_<!>()
     }

compiler/testData/diagnostics/tests/scopes/inheritance/companionObjectAfterJava.fir.kt

@@ -32,7 +32,7 @@ class D: C() {
         D.<!UNRESOLVED_REFERENCE!>foo<!>()
 
         <!UNRESOLVED_REFERENCE!>A_<!>()
-        A.A_()
+        A.<!UNRESOLVED_REFERENCE!>A_<!>()
         A.Companion.A_()
         C.<!UNRESOLVED_REFERENCE!>A_<!>()
         D.<!UNRESOLVED_REFERENCE!>A_<!>()
@@ -44,7 +44,7 @@ class D: C() {
         D.<!UNRESOLVED_REFERENCE!>bar<!>()
 
         B_()
-        B.B_()
+        B.<!UNRESOLVED_REFERENCE!>B_<!>()
         B.Companion.B_()
         C.<!UNRESOLVED_REFERENCE!>B_<!>()
         D.<!UNRESOLVED_REFERENCE!>B_<!>()

compiler/testData/diagnostics/tests/scopes/inheritance/companionObjectsOrder.fir.kt

@@ -4,7 +4,7 @@ open class A {
         fun bar() = 1
     }
     init {
-        val a: Int = <!INAPPLICABLE_CANDIDATE!>foo<!>()
+        val a: Int = foo()
         val b: Int = bar()
     }
 }
@@ -14,7 +14,7 @@ open class B: A() {
         fun bar() = ""
     }
     init {
-        val a: String = <!INAPPLICABLE_CANDIDATE!>foo<!>()
+        val a: String = foo()
         val b: String = bar()
     }
 }
@@ -24,14 +24,14 @@ fun B.Companion.foo() = ""
 
 class C: A() {
     init {
-        val a: Int = <!INAPPLICABLE_CANDIDATE!>foo<!>()
+        val a: Int = foo()
         val b: Int = bar()
     }
 }
 
 class D: B() {
     init {
-        val a: String = <!INAPPLICABLE_CANDIDATE!>foo<!>()
+        val a: String = foo()
         val b: String = bar()
     }
 }

compiler/testData/diagnostics/tests/scopes/inheritance/statics/staticVsMember.fir.kt

@@ -27,14 +27,14 @@ open class C: A() {
 
     init {
         val a: String = foo()
-        val b: String = <!AMBIGUITY!>bar<!>
+        val b: String = bar
     }
 }
 
 class E: C() {
     init {
         val a: String = foo()
-        val b: String = <!AMBIGUITY!>bar<!>
+        val b: String = bar
     }
 }