Added platform static checker with provider implementation

compiler/testData/diagnostics/testsWithStdLib/annotations/platformStatic/functions.kt

@@ -0,0 +1,54 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+import kotlin.platform.platformStatic
+
+class A {
+    class object {
+        platformStatic fun a1() {
+
+        }
+    }
+
+    object A {
+        platformStatic fun a2() {
+
+        }
+    }
+
+    fun test() {
+        val s = object {
+            <!PLATFORM_STATIC_NOT_IN_OBJECT!>platformStatic fun a3()<!> {
+
+            }
+        }
+    }
+
+    <!PLATFORM_STATIC_NOT_IN_OBJECT!>platformStatic fun a4()<!> {
+
+    }
+}
+
+trait B {
+    class object {
+        <!PLATFORM_STATIC_NOT_IN_OBJECT!>platformStatic fun a1()<!> {
+
+        }
+    }
+
+    object A {
+        platformStatic fun a2() {
+
+        }
+    }
+
+    fun test() {
+        val s = object {
+            <!PLATFORM_STATIC_NOT_IN_OBJECT!>platformStatic fun a3()<!> {
+
+            }
+        }
+    }
+
+    <!PLATFORM_STATIC_NOT_IN_OBJECT!>platformStatic fun a4()<!> {
+
+    }
+}