ICU-20482 Fix build breaks + regenerate ICU4J data files.

- Regenerate the ICU4J data files (icudata.jar and icutzdata.jar).
- Remove unsupported Java Diamond operators in order to unbreak the Java build.

icu4j/main/classes/core/src/com/ibm/icu/util/Calendar.java

@@ -1909,7 +1909,7 @@ public abstract class Calendar implements Serializable, Cloneable, Comparable<Ca
         String prefRegion = ULocale.getRegionForSupplementalData(locale, true);
 
         // Read preferred calendar values from supplementalData calendarPreferences
-        ArrayList<String> values = new ArrayList<>();
+        ArrayList<String> values = new ArrayList<String>();
 
         UResourceBundle rb = UResourceBundle.getBundleInstance(
                 ICUData.ICU_BASE_NAME,
@@ -3497,7 +3497,7 @@ public abstract class Calendar implements Serializable, Cloneable, Comparable<Ca
 
     // date format pattern cache
     private static final ICUCache<String, PatternData> PATTERN_CACHE =
-            new SimpleCache<>();
+            new SimpleCache<String, PatternData>();
     // final fallback patterns
     private static final String[] DEFAULT_PATTERNS = {
         "HH:mm:ss z",

icu4j/main/shared/data/icudata.jar

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e2bc05ad3f8975bc49cafe3c842575ddf1d8b8b5bcc228adacd33ea59ccaba7e
-size 12508534
+oid sha256:4a4454ca40c65756c0bb6bb54195e36035e3a8ab532d56a909b5553df3ad601c
+size 12508686

icu4j/main/shared/data/icutzdata.jar

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:fb0ad200a056f2838c70a4a8b3b02ebf95679f80affa782cd1ca0b7370ca2c01
+oid sha256:cd1c1d204a488fe5ffc0e1dbf3d5732123d4f6b15eddf23a92082df2377d05de
 size 92857