Introduce module 'reflection', move KFunctionN to it

Metadata for KFunction classes is now longer serialized along with built-in
classes. This effectively means that it's no longer possible to find KFunction
classes via dependency on built-ins. There should be a kotlin-runtime library
in the specified classpath for reflection types to be resolvable.

A lot of tests were moved and changed, because tests on callable references
require stdlib in classpath from now on

compiler/testData/codegen/boxWithStdlib/callableReference/function/local/unitWithSideEffect.kt

@@ -0,0 +1,15 @@
+var state = 23
+
+fun box(): String {
+    fun incrementState(inc: Int) {
+        state += inc
+    }
+
+    val inc = ::incrementState
+    inc(12)
+    inc(-5)
+    inc(27)
+    inc(-15)
+
+    return if (state == 42) "OK" else "Fail $state"
+}