drop deprecated @platformName and @platformStatic annotations

idea/testData/inspections/unusedSymbol/object/companionObjectUsedInJava.kt

@@ -1,7 +1,5 @@
 package companionObjectUsedInJava
 
-import kotlin.platform.platformStatic
-
 class A {
     companion object {
         val CONST = 42
@@ -10,7 +8,7 @@ class A {
 
 class B {
     companion object {
-        platformStatic fun foo() {
+        @JvmStatic fun foo() {
         }
     }
 }
@@ -23,7 +21,7 @@ class C {
 
 class D {
     companion object Named {
-        platformStatic fun foo() {
+        @JvmStatic fun foo() {
         }
     }
 }

idea/testData/inspections/unusedSymbol/object/companionObjectWithStatics.kt

@@ -2,7 +2,7 @@ package companionObjectWithStatics
 
 class Foo {
     companion object {
-        platformStatic fun foo() {
+        @JvmStatic fun foo() {
         }
 
         val CONST = 111

idea/testData/inspections/unusedSymbol/object/unusedButEntryPointMain.kt

@@ -2,10 +2,8 @@ package entryPoint
 
 // WITH_RUNTIME
 
-import kotlin.platform.platformStatic
-
 object EntryPoint {
-    @platformStatic public fun main(args: Array<String>) {
+    @JvmStatic public fun main(args: Array<String>) {
 
     }
 }

idea/testData/inspections/unusedSymbol/property/serialVersionUid.kt

@@ -1,10 +1,8 @@
 // FULL_JDK
 
-import kotlin.platform.platformStatic
-
 class Klass : java.io.Serializable {
     companion object {
-        private platformStatic val serialVersionUID: Long = 239
+        private @JvmStatic val serialVersionUID: Long = 239
     }
 }