Don't discriminate generics during callable references resolution

^KT-49038 Fixed

compiler/testData/diagnostics/tests/callableReference/kt49038.fir.kt

@@ -0,0 +1,13 @@
+fun take(arg: Any) {}
+
+fun <T> foo(a: A, t: T) {} // 1
+fun <T> foo(b: B, t : T) {} // 2
+fun foo(i: Int) {} // 3
+
+class A
+class B
+
+fun box(): String {
+    val ref1 = take(::foo) // error before 1.6.20; ok, resolved to (3) since 1.6.20
+    return "OK"
+}

compiler/testData/diagnostics/tests/callableReference/kt49038.kt

@@ -0,0 +1,13 @@
+fun take(arg: Any) {}
+
+fun <T> foo(a: A, t: T) {} // 1
+fun <T> foo(b: B, t : T) {} // 2
+fun foo(i: Int) {} // 3
+
+class A
+class B
+
+fun box(): String {
+    val ref1 = take(::<!CALLABLE_REFERENCE_RESOLUTION_AMBIGUITY!>foo<!>) // error before 1.6.20; ok, resolved to (3) since 1.6.20
+    return "OK"
+}

compiler/testData/diagnostics/tests/callableReference/kt49038.txt

@@ -0,0 +1,21 @@
+package
+
+public fun box(): kotlin.String
+public fun </*0*/ T> foo(/*0*/ a: A, /*1*/ t: T): kotlin.Unit
+public fun </*0*/ T> foo(/*0*/ b: B, /*1*/ t: T): kotlin.Unit
+public fun foo(/*0*/ i: kotlin.Int): kotlin.Unit
+public fun take(/*0*/ arg: kotlin.Any): kotlin.Unit
+
+public final class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class B {
+    public constructor B()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}