Fix equality comparison for inline class over inline class

^KT-54536: Fixed

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

@@ -0,0 +1,69 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +CustomEqualsInInlineClasses
+// TARGET_BACKEND: JVM_IR
+
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class A(val x: Int) {
+    fun equals(other: A) = true
+}
+
+class C
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class B1(val x: A)
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class B2(val x: A?)
+
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class D1(val x: C) {
+    fun equals(other: D1) = true
+}
+
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class D2(val x: C?) {
+    fun equals(other: D2) = true
+}
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class E1(val x: D1)
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class E2(val x: D2)
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class F<T>(val x: T)
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class G<T : D1>(val x: T)
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class H<T>(val x: F<T>)
+
+fun box(): String {
+    if (E1(D1(C())) != E1(D1(C()))) return "Fail 1"
+
+    if (E2(D2(C())) != E2(D2(C()))) return "Fail 2.1"
+    if (E2(D2(null)) != E2(D2(C()))) return "Fail 2.2"
+    if (E2(D2(C())) != E2(D2(null))) return "Fail 2.3"
+    if (E2(D2(null)) != E2(D2(null))) return "Fail 2.4"
+
+    if (B1(A(0)) != B1(A(5))) return "Fail 3"
+
+    if (B2(A(0)) != B2(A(5))) return "Fail 4.1"
+    if (B2(null) == B2(A(5))) return "Fail 4.2"
+    if (B2(A(0)) == B2(null)) return "Fail 4.3"
+    if (B2(null) != B2(null)) return "Fail 4.4"
+
+    if (F(D1(C())) != F(D1(C()))) return "Fail 5"
+
+    if (G(D1(C())) != G(D1(C()))) return "Fail 6"
+
+    if (H(F(1)) == H(F(2))) return "Fail 7"
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt54536.kt

@@ -0,0 +1,18 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +CustomEqualsInInlineClasses
+// TARGET_BACKEND: JVM_IR
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class A(val x: Int) {
+    fun equals(other: A) = x % 5 == other.x % 5
+}
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class B(val x: A)
+
+fun box() = if (B(A(0)) == B(A(5))) "OK" else "Fail"
+
+// CHECK_BYTECODE_TEXT
+// 0 INVOKESTATIC B.box-impl
+// 0 INVOKESTATIC A.box-impl