Initial version of codegen for inline classes

compiler/testData/writeSignature/inlineClasses/basicInlineClassDeclarationCodegen.kt

@@ -0,0 +1,30 @@
+// !LANGUAGE: +InlineClasses
+
+inline class Foo(val x: Int) {
+    fun empty() {}
+    fun param(y: String) {}
+    fun Any.extension() {}
+    fun Any.extensionAndParam(y: Double) {}
+
+    fun withInlineClassType(c: Foo) {}
+}
+
+// method: Foo$Erased::empty
+// jvm signature: (I)V
+// generic signature: null
+
+// method: Foo$Erased::param
+// jvm signature: (ILjava/lang/String;)V
+// generic signature: null
+
+// method: Foo$Erased::extension
+// jvm signature: (ILjava/lang/Object;)V
+// generic signature: null
+
+// method: Foo$Erased::extensionAndParam
+// jvm signature: (ILjava/lang/Object;D)V
+// generic signature: null
+
+// method: Foo$Erased::withInlineClassType
+// jvm signature: (II)V
+// generic signature: null