Validate JvmPackageName annotation value and placement

- do not allow it to be used together with JvmMultifileClass (otherwise
  implementation becomes complex)
- do not allow to declare classes in a JvmPackageName-annotated file
  (similarly, the implementation of this would be much harder in the
  compiler, and there would need to be special support in the IDE)
- check that the value is a valid FQ name
- do not allow root package just in case

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmPackageName/incorrectJvmPackageName.kt

@@ -0,0 +1,34 @@
+// !DIAGNOSTICS: -INVISIBLE_MEMBER -INVISIBLE_REFERENCE
+// !API_VERSION: 1.2
+
+// FILE: a.kt
+<!JVM_PACKAGE_NAME_NOT_SUPPORTED_IN_MULTIFILE_CLASSES!>@file:JvmPackageName("a")<!>
+@file:JvmMultifileClass
+package a
+fun a() {}
+
+// FILE: b.kt
+<!JVM_PACKAGE_NAME_CANNOT_BE_EMPTY!>@file:JvmPackageName("")<!>
+package b
+fun b() {}
+
+// FILE: c.kt
+<!JVM_PACKAGE_NAME_MUST_BE_VALID_NAME!>@file:JvmPackageName("invalid-fq-name")<!>
+package c
+fun c() {}
+
+// FILE: d.kt
+<!JVM_PACKAGE_NAME_NOT_SUPPORTED_IN_FILES_WITH_CLASSES!>@file:JvmPackageName("d")<!>
+package d
+class D
+fun d() {}
+
+// FILE: e.kt
+@file:JvmPackageName(<!CONSTANT_EXPECTED_TYPE_MISMATCH!>42<!>)
+package e
+fun e() {}
+
+// FILE: f.kt
+@file:JvmPackageName(<!EXPRESSION_EXPECTED_PACKAGE_FOUND!>f<!>)
+package f
+const val name = "f"

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmPackageName/incorrectJvmPackageName.txt

@@ -0,0 +1,32 @@
+package
+
+package a {
+    public fun a(): kotlin.Unit
+}
+
+package b {
+    public fun b(): kotlin.Unit
+}
+
+package c {
+    public fun c(): kotlin.Unit
+}
+
+package d {
+    public fun d(): kotlin.Unit
+
+    public final class D {
+        public constructor D()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
+
+package e {
+    public fun e(): kotlin.Unit
+}
+
+package f {
+    public const val name: kotlin.String = "f"
+}