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/inlineClassHashCodeOverride.kt

@@ -0,0 +1,14 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +CustomEqualsInInlineClasses
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class A(val value: MyClass) {
+    override fun hashCode() = 42
+}
+
+class MyClass() {
+    override fun hashCode() = -1
+}
+
+fun box(): String = if (A(MyClass()).hashCode() == 42) "OK" else "Fail"