Always checkout/checkin text files with lf endings

Different line endings on linux/windows prevents gradle from reusing
build cache since endings make task inputs completely different between
systems

compiler/testData/diagnostics/tests/enum/javaEnumWithAbstractFun.kt

@@ -1,17 +1,17 @@
 // FIR_IDENTICAL
-// !CHECK_TYPE
-// FILE: A.java
-public enum A {
-
-    ENTRY {
-        public String s() {
-            return "s";
-        }
-    };
-    public abstract String s();
-}
-
-// FILE: test.kt
-fun main() {
-    checkSubtype<String?>(A.ENTRY.s())
-}
+// !CHECK_TYPE
+// FILE: A.java
+public enum A {
+
+    ENTRY {
+        public String s() {
+            return "s";
+        }
+    };
+    public abstract String s();
+}
+
+// FILE: test.kt
+fun main() {
+    checkSubtype<String?>(A.ENTRY.s())
+}