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/testData/codegen/box/intrinsics/monitorEnterMonitorExit.kt

@@ -0,0 +1,17 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// WITH_RUNTIME
+
+import kotlin.jvm.internal.unsafe.*
+
+@Suppress("INVISIBLE_MEMBER")
+fun box(): String {
+    val lock = Any()
+    monitorEnter(lock)
+    try {
+        return "OK"
+    }
+    finally {
+        monitorExit(lock)
+    }
+}