KT-5524 Support [platformName] annotation for class members

@platformName is now supported for final non-overriding class member functions
(including property accessors).
Front-end provides diagnostics for inapplicable annotation cases.
Code generation updated:
- ignore kotlin.platform.platformName annotation for Java class methods;
- bridges generation generates proper JVM declarations in case of methods renamed with @platformName.
@platformName-related tests added.

#KT-5524 Fixed

compiler/testData/diagnostics/testsWithStdLib/duplicateJvmSignature/platformNamesDuplicate.kt

@@ -4,4 +4,52 @@ import kotlin.platform.*
 <!CONFLICTING_JVM_DECLARATIONS!>@platformName("bar")
 fun foo(a: Any)<!> {}
 
-<!CONFLICTING_JVM_DECLARATIONS!>fun bar(a: Any)<!> {}
+<!CONFLICTING_JVM_DECLARATIONS!>fun bar(a: Any)<!> {}
+
+class C {
+    <!CONFLICTING_JVM_DECLARATIONS!>@platformName("foo1")
+    fun foo(list: List<Int>)<!> {}
+
+    <!CONFLICTING_JVM_DECLARATIONS!>@platformName("foo1")
+    fun foo(list: List<String>)<!> {}
+}
+
+// Conflicts in inheritance.
+
+// A1 -> B1 with accidental override
+
+open class A1 {
+    <!INAPPLICABLE_PLATFORM_NAME!>@platformName("bar")<!>
+    open fun foo() {}
+}
+
+class B1 : A1() {
+    <!ACCIDENTAL_OVERRIDE!>fun bar()<!> {}
+}
+
+// A2 -> B2 with intended override and conflicting JVM declarations
+
+open class A2 {
+    <!INAPPLICABLE_PLATFORM_NAME!>@platformName("bar")<!>
+    open fun foo() {}
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>B2<!> : A2() {
+    override fun foo() {}
+
+    <!CONFLICTING_JVM_DECLARATIONS!>fun bar()<!> {}
+}
+
+// A3 -> B3 -> C3 with accidental override
+
+open class A3 {
+    <!INAPPLICABLE_PLATFORM_NAME!>@platformName("bar")<!>
+    open fun foo() {}
+}
+
+open class B3: A3() {
+}
+
+class C3: B3() {
+    <!ACCIDENTAL_OVERRIDE!>fun bar()<!> {}
+}