KT-27948: Properly coerce values when generating areEqual call

#KT-27948

compiler/testData/codegen/box/unsignedTypes/equalsImplForInlineClassWrappingNullableInlineClass.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z(val x: Int)
+inline class NZ1(val nz: Z?)
+inline class NZ2(val nz: NZ1)
+
+fun box(): String {
+    if (NZ2(NZ1(null)) != NZ2(NZ1(null))) throw AssertionError()
+    if (NZ2(NZ1(Z(1))) != NZ2(NZ1(Z(1)))) throw AssertionError()
+    if (NZ2(NZ1(null)) == NZ2(NZ1(Z(1)))) throw AssertionError()
+    if (NZ2(NZ1(Z(1))) == NZ2(NZ1(null))) throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/unsignedTypes/literalEqualsNullableUnsigned.kt

@@ -0,0 +1,17 @@
+// WITH_UNSIGNED
+// IGNORE_BACKEND: JVM_IR
+
+fun isZeroUInt(n: UInt?) = 0U == n
+fun isZeroULong(n: ULong?) = 0UL == n
+
+fun box(): String {
+    if (isZeroUInt(null)) throw AssertionError()
+    if (isZeroUInt(1U)) throw AssertionError()
+    if (!isZeroUInt(0U)) throw AssertionError()
+
+    if (isZeroULong(null)) throw AssertionError()
+    if (isZeroULong(1UL)) throw AssertionError()
+    if (!isZeroULong(0UL)) throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/unsignedTypes/nullableUnsignedEqualsLiteral.kt

@@ -0,0 +1,17 @@
+// WITH_UNSIGNED
+// IGNORE_BACKEND: JVM_IR
+
+fun isZeroUInt(n: UInt?) = n == 0U
+fun isZeroULong(n: ULong?) = n == 0UL
+
+fun box(): String {
+    if (isZeroUInt(null)) throw AssertionError()
+    if (isZeroUInt(1U)) throw AssertionError()
+    if (!isZeroUInt(0U)) throw AssertionError()
+
+    if (isZeroULong(null)) throw AssertionError()
+    if (isZeroULong(1UL)) throw AssertionError()
+    if (!isZeroULong(0UL)) throw AssertionError()
+
+    return "OK"
+}