Support calling methods annotated with PolymorphicSignature

#KT-14416 Fixed
 #KT-26165 Fixed

compiler/testData/codegen/box/polymorphicSignature/invokeExactWithInlineClass.kt

@@ -0,0 +1,23 @@
+// !LANGUAGE: +PolymorphicSignature
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND: JVM_IR
+// FULL_JDK
+// SKIP_JDK6
+// WITH_REFLECT
+
+import java.lang.invoke.MethodHandles
+import kotlin.reflect.jvm.javaMethod
+
+inline class Z(val s: String)
+
+fun foo(z: Z): String = z.s
+
+fun box(): String {
+    val mh = MethodHandles.lookup().unreflect(::foo.javaMethod!!)
+
+    // TODO: it's unclear whether this should throw or not, see KT-28214.
+    val r1 = mh.invokeExact(Z("OK")) as String
+    if (r1 != "OK") return "Fail r1: $r1"
+
+    return mh.invokeExact("OK") as String
+}