[FIR] Fix serialization of empty varargs in annotations in KLIBs

#KT-59249 Fixed

compiler/testData/loadJava/compiledKotlin/annotations/packageMembers/StringArrayArgument.kt

@@ -1,11 +1,33 @@
 // PLATFORM_DEPENDANT_METADATA
-//ALLOW_AST_ACCESS
+// ALLOW_AST_ACCESS
+// NO_CHECK_SOURCE_VS_BINARY
+// IGNORE_BACKEND_K1: JVM_IR, ANY
+// LANGUAGE: +MultiPlatformProjects
+// IGNORE K1
+// ^mute KotlinpCompilerTestDataTest
+// K1/K2 difference: KT-60820
+
+// MODULE: common
+// FILE: common.kt
+package test
+
+expect annotation class Anno4(vararg val t: String)
+expect annotation class Anno5(vararg val t: String = [])
+expect annotation class Anno6(vararg val t: String = ["a"])
+
+// MODULE: platform()()(common)
+// FILE: test.kt
 package test
 
 annotation class Anno(vararg val t: String)
+annotation class Anno2(vararg val t: String = [])
+annotation class Anno3(vararg val t: String = ["a"])
+actual annotation class Anno4(vararg val t: String)
+actual annotation class Anno5(vararg val t: String)
+actual annotation class Anno6(vararg val t: String)
 
 @Anno("live", "long") fun foo() {}
 
 @field:Anno("prosper") val bar = { 42 }()
 
-@Anno() fun baz() {}
+@Anno() @Anno2() @Anno3() @Anno4() @Anno5() @Anno6() fun baz() {}