[FIR] Add smartcasts from == if equals is from Any

^KT-49127 Fixed

compiler/fir/analysis-tests/testData/resolve/smartcasts/smartcastsFromEquals_sameModule.kt

@@ -0,0 +1,55 @@
+// ISSUE: KT-49127
+
+class Final<T>
+
+open class Base<T>
+
+class Derived<T> : Base<T>()
+
+class FinalWithOverride<T> {
+    override fun equals(other: Any?): Boolean {
+        // some custom implementation
+        return this === other
+    }
+}
+
+fun testFinal(x: Final<*>, y: Final<Int>) {
+    if (x == y) {
+        takeIntFinal(x) // OK
+    }
+    if (x === y) {
+        takeIntFinal(x) // OK
+    }
+}
+
+fun testBase(x: Base<*>, y: Base<Int>) {
+    if (x == y) {
+        takeIntBase(<!ARGUMENT_TYPE_MISMATCH!>x<!>) // Error
+    }
+    if (x === y) {
+        takeIntBase(x) // OK
+    }
+}
+
+fun testDerived(x: Derived<*>, y: Derived<Int>) {
+    if (x == y) {
+        takeIntDerived(x) // OK
+    }
+    if (x === y) {
+        takeIntDerived(x) // OK
+    }
+}
+
+fun testFinalWithOverride(x: FinalWithOverride<*>, y: FinalWithOverride<Int>) {
+    if (x == y) {
+        takeIntFinalWithOverride(<!ARGUMENT_TYPE_MISMATCH!>x<!>) // Error
+    }
+    if (x === y) {
+        takeIntFinalWithOverride(x) // OK
+    }
+}
+
+fun takeIntFinal(x: Final<Int>) {}
+fun takeIntBase(x: Base<Int>) {}
+fun takeIntDerived(x: Derived<Int>) {}
+fun takeIntFinalWithOverride(x: FinalWithOverride<Int>) {}