8371746: Some imports in Integer.java and Long.java became unused after JDK-8370503

Reviewed-by: liach, darcy, iris

Author: mrserb

src/java.base/share/classes/java/lang/Integer.java

@@ -41,8 +41,6 @@
 
 import static java.lang.Character.digit;
 import static java.lang.String.COMPACT_STRINGS;
-import static java.lang.String.LATIN1;
-import static java.lang.String.UTF16;
 
 /**
  * The {@code Integer} class is the {@linkplain

src/java.base/share/classes/java/lang/Long.java

@@ -41,8 +41,6 @@
 
 import static java.lang.Character.digit;
 import static java.lang.String.COMPACT_STRINGS;
-import static java.lang.String.LATIN1;
-import static java.lang.String.UTF16;
 
 /**
  * The {@code Long} class is the {@linkplain