Basic inline class mapping to the underlying representation

compiler/testData/writeSignature/inlineClasses/simpleSignatureWithInlineClassTypesAsPrimitive.kt

@@ -0,0 +1,26 @@
+// !LANGUAGE: +InlineClasses
+
+inline class Foo(val x: Int)
+
+object Test {
+    fun asParam(a: Foo) {}
+    fun asReturn(): Foo = TODO()
+    fun Foo.asExtension() {}
+    fun Foo.asAll(x: Any?, a: Foo, b: Int): Foo = TODO()
+}
+
+// method: Test::asParam
+// jvm signature: (I)V
+// generic signature: null
+
+// method: Test::asReturn
+// jvm signature: ()I
+// generic signature: null
+
+// method: Test::asExtension
+// jvm signature: (I)V
+// generic signature: null
+
+// method: Test::asAll
+// jvm signature: (ILjava/lang/Object;II)I
+// generic signature: null

compiler/testData/writeSignature/inlineClasses/simpleSignatureWithInlineClassTypesAsReference.kt

@@ -0,0 +1,19 @@
+// !LANGUAGE: +InlineClasses
+
+inline class Foo(val x: Int?)
+
+class SimpleClass
+inline class Bar(val x: SimpleClass)
+
+object Test {
+    fun asParam(a: Foo) {}
+    fun asReturn(): Bar = TODO()
+}
+
+// method: Test::asParam
+// jvm signature: (Ljava/lang/Integer;)V
+// generic signature: null
+
+// method: Test::asReturn
+// jvm signature: ()LSimpleClass;
+// generic signature: null