Deprecate public access to @JvmField/const fields in private companions

#KT-25009

compiler/testData/codegen/bytecodeListing/privateCompanionFields.kt

@@ -0,0 +1,32 @@
+// WITH_RUNTIME
+class TestClass {
+
+    private companion object {
+        @JvmField
+        var test: String = "1"
+
+        @JvmField
+        @java.lang.Deprecated
+        var test2: String = "2"
+
+        @JvmField
+        val test3: String = "3"
+
+        const val testConst = 1
+    }
+}
+
+interface TestConst {
+
+    private companion object {
+        const val testConst = 1
+    }
+}
+
+interface TestJvmField {
+
+    private companion object {
+        @JvmField
+        val test3: String = "3"
+    }
+}

compiler/testData/codegen/bytecodeListing/privateCompanionFields.txt

@@ -0,0 +1,57 @@
+@kotlin.Metadata
+final class TestClass$Companion {
+    // source: 'privateCompanionFields.kt'
+    private method <init>(): void
+    public synthetic method <init>(p0: kotlin.jvm.internal.DefaultConstructorMarker): void
+    private final inner class TestClass$Companion
+}
+
+@kotlin.Metadata
+public final class TestClass {
+    // source: 'privateCompanionFields.kt'
+    private final static @org.jetbrains.annotations.NotNull field Companion: TestClass$Companion
+    public deprecated static @java.lang.Deprecated @kotlin.jvm.JvmField @org.jetbrains.annotations.NotNull field test2: java.lang.String
+    public deprecated final static @java.lang.Deprecated @kotlin.jvm.JvmField @org.jetbrains.annotations.NotNull field test3: java.lang.String
+    public deprecated static @java.lang.Deprecated @kotlin.jvm.JvmField @org.jetbrains.annotations.NotNull field test: java.lang.String
+    public deprecated final static @java.lang.Deprecated field testConst: int
+    static method <clinit>(): void
+    public method <init>(): void
+    private final inner class TestClass$Companion
+}
+
+@kotlin.Metadata
+final class TestConst$Companion {
+    // source: 'privateCompanionFields.kt'
+    synthetic final static field $$INSTANCE: TestConst$Companion
+    public final static field testConst: int
+    static method <clinit>(): void
+    private method <init>(): void
+    public final inner class TestConst$Companion
+}
+
+@kotlin.Metadata
+public interface TestConst {
+    // source: 'privateCompanionFields.kt'
+    public synthetic final static @org.jetbrains.annotations.NotNull field Companion: TestConst$Companion
+    public deprecated final static @java.lang.Deprecated field testConst: int
+    static method <clinit>(): void
+    public final inner class TestConst$Companion
+}
+
+@kotlin.Metadata
+final class TestJvmField$Companion {
+    // source: 'privateCompanionFields.kt'
+    synthetic final static field $$INSTANCE: TestJvmField$Companion
+    private method <init>(): void
+    public synthetic method <init>(p0: kotlin.jvm.internal.DefaultConstructorMarker): void
+    public final inner class TestJvmField$Companion
+}
+
+@kotlin.Metadata
+public interface TestJvmField {
+    // source: 'privateCompanionFields.kt'
+    public synthetic final static @org.jetbrains.annotations.NotNull field Companion: TestJvmField$Companion
+    public deprecated final static @java.lang.Deprecated @kotlin.jvm.JvmField @org.jetbrains.annotations.NotNull field test3: java.lang.String
+    static method <clinit>(): void
+    public final inner class TestJvmField$Companion
+}