JVM_IR: Generate private suspend functions as synthetic package-private

Do not generate accessors for them.
 #KT-37086 Fixed

compiler/testData/codegen/bytecodeListing/coroutines/privateAccessor.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
-// TODO: KT-37086
 // WITH_RUNTIME
 // COMMON_COROUTINES_TEST
 import COROUTINES_PACKAGE.*

compiler/testData/codegen/bytecodeListing/coroutines/privateAccessor_ir.txt

@@ -0,0 +1,6 @@
+@kotlin.Metadata
+public final class PrivateAccessorKt {
+    public synthetic final static method access$foo(): void
+    synthetic final static method bar(p0: kotlin.coroutines.Continuation): java.lang.Object
+    private final static method foo(): void
+}