Generate private suspend functions as private (not synthetic package-private)

#KT-26592 Fixed

compiler/testData/codegen/box/coroutines/featureIntersection/jvmDefault.kt

@@ -2,7 +2,6 @@
 // !JVM_DEFAULT_MODE: all
 // TARGET_BACKEND: JVM
 // JVM_TARGET: 1.8
-// IGNORE_BACKEND: JVM
 
 import kotlin.coroutines.*
 

compiler/testData/codegen/box/jvm8/defaults/noDefaultImpls/privateSuspend.kt

@@ -3,7 +3,6 @@
 // JVM_TARGET: 1.8
 // WITH_COROUTINES
 // WITH_RUNTIME
-// IGNORE_BACKEND: JVM
 import helpers.*
 import kotlin.coroutines.*
 import kotlin.coroutines.intrinsics.*