JVM IR: Do not generate private suspend functions as synthetic package-private

#KT-26592

compiler/testData/codegen/box/coroutines/suspendConversion/onInlineArgument.kt

@@ -2,6 +2,7 @@
 // WITH_RUNTIME
 // WITH_COROUTINES
 // IGNORE_BACKEND: JVM, NATIVE
+// IGNORE_BACKEND_FIR: JVM_IR
 // IGNORE_LIGHT_ANALYSIS
 
 // `lambda` should not be wrapped in yet another object (so no OnInlineArgumentKt$box$1$1).

compiler/testData/codegen/box/coroutines/suspendConversion/onInlineArgument_ir.txt

@@ -8,6 +8,7 @@ final class OnInlineArgumentKt$box$1 {
     field label: int
     inner (anonymous) class OnInlineArgumentKt$box$1
     method <init>(p0: kotlin.jvm.internal.Ref$ObjectRef, p1: kotlin.jvm.functions.Function1, p2: kotlin.coroutines.Continuation): void
+    public synthetic final static method access$invokeSuspend$suspendConversion0(p0: kotlin.jvm.functions.Function1, p1: java.lang.String, p2: kotlin.coroutines.Continuation): java.lang.Object
     public final @org.jetbrains.annotations.NotNull method create(@org.jetbrains.annotations.NotNull p0: kotlin.coroutines.Continuation): kotlin.coroutines.Continuation
     public final @org.jetbrains.annotations.Nullable method invoke(@org.jetbrains.annotations.Nullable p0: kotlin.coroutines.Continuation): java.lang.Object
     public synthetic bridge method invoke(p0: java.lang.Object): java.lang.Object

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

@@ -0,0 +1,7 @@
+@kotlin.Metadata
+public final class PrivateAccessorKt {
+    // source: 'privateAccessor.kt'
+    public synthetic final static method access$bar(p0: kotlin.coroutines.Continuation): java.lang.Object
+    private final static method bar(p0: kotlin.coroutines.Continuation): java.lang.Object
+    private final static method foo(): void
+}

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

@@ -2,11 +2,13 @@
 public final class A {
     // source: 'privateSuspendFun.kt'
     public method <init>(): void
-    synthetic final method foo(p0: kotlin.coroutines.Continuation): java.lang.Object
+    public synthetic final static method access$foo(p0: A, p1: kotlin.coroutines.Continuation): java.lang.Object
+    private final method foo(p0: kotlin.coroutines.Continuation): java.lang.Object
 }
 
 @kotlin.Metadata
 public final class PrivateSuspendFunKt {
     // source: 'privateSuspendFun.kt'
-    synthetic final static method foo(p0: kotlin.coroutines.Continuation): java.lang.Object
+    public synthetic final static method access$foo(p0: kotlin.coroutines.Continuation): java.lang.Object
+    private final static method foo(p0: kotlin.coroutines.Continuation): java.lang.Object
 }