[stdlib] Remove bootstrap implementation of enumEntriesIntrinsic

It should have been already implemented as intrinsic in all backends.

Do not test enumEntries intrinsic in the old JVM BE.

KT-53154

Co-authored-by: Alexander Udalov <alexander.udalov@jetbrains.com>

compiler/testData/codegen/boxInline/enum/javaEnumEntries.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM_IR
+// IGNORE_BACKEND_MULTI_MODULE: JVM_MULTI_MODULE_IR_AGAINST_OLD
 // NO_CHECK_LAMBDA_INLINING
 // !OPT_IN: kotlin.ExperimentalStdlibApi
 // WITH_STDLIB