JVM_IR: Fix Inline CallableReferences with Varargs

- Added tests to demonstrate broken behaviour: the interaction of inline
  functions and callable references with varargs and defaults in various
  combinations.
- Refactored InlineCallableReferencesToLambdaPhase to look like and use
  some of the infrastructure from CallableReferenceLowering.
- Lifted some of this infrastructure out to be broadly reusable.

compiler/testData/codegen/box/callableReference/varargAndDefaults/inlineVarargAndDefault.kt

@@ -0,0 +1,9 @@
+// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType
+// IGNORE_BACKEND: JS, JS_IR
+
+fun foo(vararg l: Long, s: String = "OK"): String =
+        if (l.size == 0) s else "Fail"
+
+inline fun bar(f: () -> String): String = f()
+
+fun box(): String = bar(::foo)