When checking overrides, compare methods structurally

Because they may come from different copies of the same class from different modules

compiler/testData/diagnostics/tests/multimodule/duplicateMethod/sameGenericsInParams.kt

@@ -0,0 +1,43 @@
+// !DIAGNOSTICS: -UNNECESSARY_SAFE_CALL
+
+// MODULE: m0
+// FILE: a.kt
+package p
+
+public trait G1<T>
+public trait G2<A, B>
+
+// MODULE: m1(m0)
+// FILE: a.kt
+package p
+
+public trait B {
+    public fun foo(a: G1<Int>, b: G2<B, String>): B?
+}
+
+// MODULE: m2(m1, m0)
+// FILE: b.kt
+package p
+
+public trait C : B {
+    override fun foo(a: G1<Int>, b: G2<B, String>): B?
+
+}
+
+// MODULE: m3(m0)
+// FILE: b.kt
+package p
+
+public trait B {
+    public fun foo(a: G1<Int>, b: G2<B, String>): B?
+}
+
+// MODULE: m4(m3, m2, m0)
+// FILE: c.kt
+import p.*
+
+fun test(b: B?, a: G1<Int>, b1: G2<B, String>) {
+    if (b is C) {
+        <!DEBUG_INFO_AUTOCAST!>b<!>?.foo(a, b1)
+    }
+}