Gradual migration of operator 'mod' to 'rem'

- Introduce new 'rem' operator convention
 - Prefer 'rem()' to 'mod()' when both are available, even if mod() is a
   member, and rem() -- an extension
 - Place operator 'rem' under the language feature

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeCodegenTestGenerated.java

@@ -10454,6 +10454,18 @@ public class LightAnalysisModeCodegenTestGenerated extends AbstractLightAnalysis
             doTest(fileName);
         }
 
+        @TestMetadata("remAssignmentOperation.kt")
+        public void testRemAssignmentOperation() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/operatorConventions/remAssignmentOperation.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("remOverModOperation.kt")
+        public void testRemOverModOperation() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/operatorConventions/remOverModOperation.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("compiler/testData/codegen/box/operatorConventions/compareTo")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)