8004068: Fix build problems caused by on-demand imports

Reviewed-by: jjg
Contributed-by: eric.caspole@amd.com

src/share/classes/com/sun/tools/javac/code/Types.java

@@ -26,7 +26,13 @@
 package com.sun.tools.javac.code;
 
 import java.lang.ref.SoftReference;
-import java.util.*;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.WeakHashMap;
 
 import com.sun.tools.javac.code.Attribute.RetentionPolicy;
 import com.sun.tools.javac.code.Lint.LintCategory;