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/functionGenericsInParamsNotIs.kt

@@ -0,0 +1,40 @@
+// !DIAGNOSTICS: -UNNECESSARY_SAFE_CALL
+
+// MODULE: m1
+// FILE: a.kt
+package p
+
+public trait B {
+    public fun <T> foo(a: T): B?
+}
+
+// MODULE: m2(m1)
+// FILE: b.kt
+package p
+
+public trait C : B {
+    override fun <T> foo(a: T): B?
+
+}
+
+// MODULE: m3
+// FILE: b.kt
+package p
+
+public trait B {
+    public fun <T> foo(a: T): B?
+}
+
+// MODULE: m4(m3, m2)
+// FILE: c.kt
+import p.*
+
+fun test(b: B?) {
+    if (b !is C)  return
+    <!DEBUG_INFO_AUTOCAST!>b<!>?.foo("")
+}
+
+fun test1(b: B?) {
+    if (b !is C)  return
+    <!DEBUG_INFO_AUTOCAST!>b<!>?.foo<String>("")
+}