[IR] Support user-defined equals for MFVC

Signed-off-by: Evgeniy.Zhelenskiy <Evgeniy.Zhelenskiy@jetbrains.com>

#KT-1179

compiler/testData/codegen/box/inlineClasses/inlineClassEqualsOverriddenForCollections.kt

@@ -0,0 +1,25 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// https://youtrack.jetbrains.com/issue/KT-52236/Different-modality-in-psi-and-fir
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +CustomEqualsInValueClasses
+// TARGET_BACKEND: JVM_IR
+// CHECK_BYTECODE_LISTING
+
+import kotlin.math.abs
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class IC(val x: Double) {
+    operator fun equals(other: IC): Boolean {
+        return abs(x - other.x) < 0.1
+    }
+
+    override fun hashCode(): Int {
+        return 0
+    }
+}
+
+fun box(): String {
+    val set = setOf(IC(1.0), IC(1.5), IC(1.501))
+    return if (set.size == 2) "OK" else "Fail"
+}