Fix KCallable#callBy to JvmStatic companion object members

#KT-12915 Fixed

compiler/testData/codegen/box/reflection/callBy/companionObject.kt

@@ -0,0 +1,31 @@
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+class C {
+    companion object {
+        fun foo(a: String, b: String = "b") = a + b
+    }
+}
+
+fun box(): String {
+    val f = C.Companion::class.members.single { it.name == "foo" }
+
+    // Any object method currently requires the object instance passed
+    try {
+        f.callBy(mapOf(
+                f.parameters.single { it.name == "a" } to "a"
+        ))
+        return "Fail: IllegalArgumentException should have been thrown"
+    }
+    catch (e: IllegalArgumentException) {
+        // OK
+    }
+
+    assertEquals("ab", f.callBy(mapOf(
+            f.parameters.first() to C,
+            f.parameters.single { it.name == "a" } to "a"
+    )))
+
+    return "OK"
+}

compiler/testData/codegen/box/reflection/callBy/jvmStaticInCompanionObject.kt

@@ -0,0 +1,34 @@
+// WITH_REFLECT
+
+// KT-12915 IAE on callBy of JvmStatic function with default arguments
+
+import kotlin.test.assertEquals
+
+class C {
+    companion object {
+        @JvmStatic
+        fun foo(a: String, b: String = "b") = a + b
+    }
+}
+
+fun box(): String {
+    val f = C.Companion::class.members.single { it.name == "foo" }
+
+    // Any object method currently requires the object instance passed
+    try {
+        f.callBy(mapOf(
+                f.parameters.single { it.name == "a" } to "a"
+        ))
+        return "Fail: IllegalArgumentException should have been thrown"
+    }
+    catch (e: IllegalArgumentException) {
+        // OK
+    }
+
+    assertEquals("ab", f.callBy(mapOf(
+            f.parameters.first() to C,
+            f.parameters.single { it.name == "a" } to "a"
+    )))
+
+    return "OK"
+}