Raise deprecation level for mod operators to ERROR in stdlib

#KT-25217 In Progress

generators/builtins/primitives.kt

@@ -174,7 +174,7 @@ class GeneratePrimitives(out: PrintWriter) : BuiltInsSourceGenerator(out) {
                     out.println("    @SinceKotlin(\"1.1\")")
 
                 "mod" ->
-                    out.println("    @Deprecated(\"Use rem(other) instead\", ReplaceWith(\"rem(other)\"), DeprecationLevel.WARNING)")
+                    out.println("    @Deprecated(\"Use rem(other) instead\", ReplaceWith(\"rem(other)\"), DeprecationLevel.ERROR)")
             }
             out.println("    public operator fun $name(other: ${otherKind.capitalized}): ${returnType.capitalized}")
         }

generators/tests/org/jetbrains/kotlin/generators/evaluate/GenerateOperationsMap.kt

@@ -38,6 +38,8 @@ fun generate(): String {
     val sb = StringBuilder()
     val p = Printer(sb)
     p.println(File("license/LICENSE.txt").readText())
+    p.println("@file:Suppress(\"DEPRECATION_ERROR\")")
+    p.println()
     p.println("package org.jetbrains.kotlin.resolve.constants.evaluate")
     p.println()
     p.println("import java.math.BigInteger")