JVM: Add more tests to jvm-abi-gen

plugins/jvm-abi-gen/testData/compare/anonymousObjects/base/test.kt

@@ -0,0 +1,5 @@
+package test
+
+private val x = object { fun f() = 1 }
+
+fun g() = x.f() + object { fun f() = 0 }.f()

plugins/jvm-abi-gen/testData/compare/anonymousObjects/directives.txt

@@ -0,0 +1 @@
+// IGNORE_BACKEND_LEGACY: JVM

plugins/jvm-abi-gen/testData/compare/anonymousObjects/sameAbi/test.kt

@@ -0,0 +1,3 @@
+package test
+
+fun g() = 1