Minor, rename codegen tests on platformName and platformStatic

compiler/testData/codegen/boxWithStdlib/jvmName/functionName.kt

@@ -0,0 +1,11 @@
+import kotlin.platform.*
+
+@platformName("bar")
+fun foo() = "foo"
+
+fun box(): String {
+    val f = foo()
+    if (f != "foo") return "Fail: $f"
+
+    return "OK"
+}