JVM IR: do not add suffix for accessors to top level functions

This only reproduced when compiling (technically incorrect) code in the
standard library, where private functions monitorEnter/monitorExit are
accessed from another file, and their names with suffixes are not
recognized as intrinsics which should be replaced by
monitorenter/monitorexit JVM bytecode instructions.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/intrinsics/IrIntrinsicMethods.kt

@@ -51,13 +51,13 @@ class IrIntrinsicMethods(val irBuiltIns: IrBuiltIns, val symbols: JvmSymbols) {
                 Key(
                     kotlinJvmInternalUnsafe,
                     null,
-                    "access\$monitorEnter\$0",
+                    "access\$monitorEnter",
                     listOf(KotlinBuiltIns.FQ_NAMES.any.toSafe())
                 ) to MonitorInstruction.MONITOR_ENTER,
                 Key(
                     kotlinJvmInternalUnsafe,
                     null,
-                    "access\$monitorExit\$1",
+                    "access\$monitorExit",
                     listOf(KotlinBuiltIns.FQ_NAMES.any.toSafe())
                 ) to MonitorInstruction.MONITOR_EXIT,
                 Key(

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/SyntheticAccessorLowering.kt

@@ -459,6 +459,9 @@ internal class SyntheticAccessorLowering(val context: JvmBackendContext) : IrEle
     private fun IrFunction.accessorName(superQualifier: IrClassSymbol?): Name {
         val jvmName = context.methodSignatureMapper.mapFunctionName(this)
         val suffix = when {
+            // Accessors for top level functions never need a suffix.
+            isTopLevel -> ""
+
             // The only function accessors placed on interfaces are for private functions and JvmDefault implementations.
             // The two cannot clash.
             parentAsClass.isJvmInterface && Visibilities.isPrivate(visibility) -> ""