Add ClassDescriptor.getInlineClassRepresentation

This will be used at least in the JVM backend instead of the current
approach where we're loading the primary constructor's first parameter,
which isn't good enough since primary constructor can be private, and
we can't rely on private declarations in case they're declared in
another module.

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java

@@ -4470,6 +4470,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
                 runTest("compiler/testData/codegen/box/compileKotlinAgainstKotlin/inlineClasses/defaultWithInlineClassAndReceivers.kt");
             }
 
+            @TestMetadata("extensionPropertyWithSameName.kt")
+            public void testExtensionPropertyWithSameName() throws Exception {
+                runTest("compiler/testData/codegen/box/compileKotlinAgainstKotlin/inlineClasses/extensionPropertyWithSameName.kt");
+            }
+
             @TestMetadata("funInterface.kt")
             public void testFunInterface() throws Exception {
                 runTest("compiler/testData/codegen/box/compileKotlinAgainstKotlin/inlineClasses/funInterface.kt");