Basic invokedynamic string concatenation support

compiler/testData/codegen/bytecodeText/stringOperations/concatDynamicConstants.kt

@@ -0,0 +1,14 @@
+// JVM_TARGET: 9
+class A
+
+inline fun test(s: (String) -> Unit) {
+    s("456")
+}
+
+fun box(a: String, b: String?) {
+    val s = a + "1" + "2" + 3 + 4L + b + 5.0 + 6F + '7' + A()
+}
+
+// 1INVOKEDYNAMIC makeConcatWithConstants
+// 0 append
+// 0 stringPlus