Support introspection of parameter names and indices in reflection

compiler/testData/codegen/boxWithStdlib/reflection/parameters/functionParameterNameAndIndex.kt

@@ -0,0 +1,27 @@
+import kotlin.reflect.*
+import kotlin.test.assertEquals
+
+fun foo(bar: String): Int = bar.length()
+
+class A(val c: String) {
+    fun foz(baz: Int) {}
+}
+
+fun Int.qux(zux: String) {}
+
+fun checkParameters(f: KFunction<*>, names: List<String?>) {
+    val params = f.parameters
+    assertEquals(names, params.map { it.name })
+    assertEquals((0..params.size() - 1).toList(), params.mapIndexed { index, element -> index })
+}
+
+fun box(): String {
+    checkParameters(::box, listOf())
+    checkParameters(::foo, listOf("bar"))
+    checkParameters(A::foz, listOf(null, "baz"))
+    checkParameters(Int::qux, listOf(null, "zux"))
+
+    checkParameters(::A, listOf("c"))
+
+    return "OK"
+}

compiler/testData/codegen/boxWithStdlib/reflection/parameters/propertySetter.kt

@@ -0,0 +1,24 @@
+import kotlin.reflect.*
+import kotlin.test.assertEquals
+
+var default: Int = 0
+
+var defaultAnnotated: Int = 0
+    public set
+
+var custom: Int = 0
+    set(myName: Int) {}
+
+fun checkPropertySetterParam(property: KMutableProperty<*>, name: String?) {
+    val parameter = property.setter.parameters.single()
+    assertEquals(0, parameter.index)
+    assertEquals(name, parameter.name)
+}
+
+fun box(): String {
+    checkPropertySetterParam(::default, null)
+    checkPropertySetterParam(::defaultAnnotated, null)
+    checkPropertySetterParam(::custom, "myName")
+
+    return "OK"
+}