JVM BE: Add more tests for default arguments

- Inline class parameters should not be boxed.
- Empty vararg parameters should not allocate an empty array.

compiler/testData/codegen/bytecodeText/defaultArguments/noEmptyArray.kt

@@ -0,0 +1,9 @@
+// IGNORE_BACKEND: JVM_IR
+
+// There is one ANEWARRAY instruction here, to generate the default parameter value.
+fun default(vararg s: String = arrayOf("OK")) = s[0]
+
+// This call on the other hand shouldn't allocate anything.
+fun callDefault() = default()
+
+// 1 ANEWARRAY