JS: optimize default arguments in cross-module inliner

This reduces size of circlet UI (of approx 2.5 mb) by about 90 kb

js/js.translator/testData/box/inlineSizeReduction/multiModuleDefaultArgsCleanup.kt

@@ -0,0 +1,17 @@
+// EXPECTED_REACHABLE_NODES: 1018
+// MODULE: lib
+// FILE: lib.kt
+inline fun foo(x: String = "x", y: String = "y") = x + y
+
+// MODULE: main(lib)
+// FILE: main.kt
+// CHECK_VARS_COUNT: function=test count=0
+
+fun test() = foo() + ";" + foo(x = "X") + ";" + foo(y = "Y") + ";" + foo(x = "X", y = "Y")
+
+fun box(): String {
+    val r = test()
+    if (test() != "xy;Xy;xY;XY") return "fail: $r"
+
+    return "OK"
+}