Refine multi-file facades generation

Do not generate delegation from multi-file facade to inline-only functions
because they are effectively private in bytecode

 #KT-10858 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/MultifileClassCodegen.kt

@@ -213,7 +213,8 @@ class MultifileClassCodegen(
             if (declaration is KtNamedFunction || declaration is KtProperty) {
                 val descriptor = state.bindingContext.get(BindingContext.DECLARATION_TO_DESCRIPTOR, declaration)
                 assert(descriptor is CallableMemberDescriptor) { "Expected callable member, was " + descriptor + " for " + declaration.text }
-                if (!Visibilities.isPrivate((descriptor as CallableMemberDescriptor).visibility)) {
+                if (!Visibilities.isPrivate((descriptor as CallableMemberDescriptor).visibility)
+                        && AsmUtil.getVisibilityAccessFlag(descriptor) != Opcodes.ACC_PRIVATE) {
                     generateCallableMemberTasks.put(descriptor, { memberCodegen.genFunctionOrProperty(declaration) })
                 }
             }

compiler/testData/codegen/boxInline/multifileClasses/inlineFromOtherPackage.1.kt

@@ -1,3 +1,7 @@
 import a.foo
+import a.inlineOnly
 
-fun box(): String = foo { "OK" }
+fun box(): String {
+    if (!a.inlineOnly<String>("OK")) return "fail 1"
+   return foo { "OK" }
+}

compiler/testData/codegen/boxInline/multifileClasses/inlineFromOtherPackage.2.kt

@@ -3,4 +3,6 @@ package a
 
 inline fun foo(body: () -> String): String = bar(body())
 
-public fun bar(x: String): String = x
+public fun bar(x: String): String = x
+
+inline fun <reified T> inlineOnly(x: Any?): Boolean = x is T

compiler/testData/codegen/bytecodeListing/InlineOnlyMultifile.kt

@@ -0,0 +1,10 @@
+@file:[JvmName("Foo") JvmMultifileClass]
+package test
+
+fun foo() {
+    inlineOnly<String>()
+}
+
+// No method should be generated in multifile facade for 'inlineOnly'
+// Because 'inlineOnly' is private in file part (because it's inline-only) and can't be delegated from facade
+public inline fun <reified T> inlineOnly() {}

compiler/testData/codegen/bytecodeListing/InlineOnlyMultifile.txt

@@ -0,0 +1,12 @@
+@kotlin.Metadata
+@kotlin.jvm.internal.KotlinMultifileClass
+public final class test/Foo {
+    public final static method foo(): void
+}
+
+@kotlin.Metadata
+@kotlin.jvm.internal.KotlinMultifileClassPart
+synthetic final class test/Foo__InlineOnlyMultifileKt {
+    public final static method foo(): void
+    private final static method inlineOnly(): void
+}

compiler/tests/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java

@@ -47,6 +47,12 @@ public class BytecodeListingTestGenerated extends AbstractBytecodeListingTest {
         doTest(fileName);
     }
 
+    @TestMetadata("InlineOnlyMultifile.kt")
+    public void testInlineOnlyMultifile() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeListing/InlineOnlyMultifile.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("compiler/testData/codegen/bytecodeListing/annotations")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)