Support of custom 'equals' and 'hashCode' in inline classes

'equals' from any made available for overriding in inline classes
'typed' equals made available for definition in inline classes
'typed' equals definition made compulsory if 'untyped' is overridden
'operator' keyword is allowed in 'typed' equals definition

^KT-24874: Fixed

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

@@ -0,0 +1,35 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +CustomEqualsInInlineClasses
+// TARGET_BACKEND: JVM_IR
+
+import kotlin.math.abs
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class IC1(val value: Double) {
+    fun equals(other: IC1): Boolean {
+        return abs(value - other.value) < 0.1
+    }
+}
+
+interface I {
+    fun equals(param: IC2): Boolean
+}
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class IC2(val value: Int) : I {
+    override fun equals(param: IC2): Boolean {
+        return abs(value - param.value) < 2
+    }
+}
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class IC3(val value: Int) {
+
+}
+
+fun box() =
+    if (IC1(1.0) == IC1(1.05) && IC1(1.0) != IC1(1.2)
+        && IC2(5) == IC2(6) && IC2(5) != IC2(7)
+        && IC3(5) == IC3(5) && IC3(5) != IC3(6)
+        && IC1(1.0) != Any()) "OK" else "Fail"