RFR [9] Remove sun.misc.Unsafe dependency from sun.nio.cs.StringUTF16

[Chris Hegarty]

Looks like the Compact Strings work inadvertently introduced a
dependency on sun.misc.Unsafe. ( just temporary confusion with
having two Unsafes until the jdk.unsupported module is defined )

diff --git a/src/java.base/share/classes/sun/nio/cs/StringUTF16.java 
b/src/java.base/share/classes/sun/nio/cs/StringUTF16.java
--- a/src/java.base/share/classes/sun/nio/cs/StringUTF16.java
+++ b/src/java.base/share/classes/sun/nio/cs/StringUTF16.java
@@ -25,8 +25,8 @@

  package sun.nio.cs;

-import static sun.misc.Unsafe.ARRAY_BYTE_BASE_OFFSET;
-import static sun.misc.Unsafe.ARRAY_BYTE_INDEX_SCALE;
+import static jdk.internal.misc.Unsafe.ARRAY_BYTE_BASE_OFFSET;
+import static jdk.internal.misc.Unsafe.ARRAY_BYTE_INDEX_SCALE;

  class StringUTF16 {

@@ -35,5 +35,5 @@
                                ARRAY_BYTE_BASE_OFFSET + 
ARRAY_BYTE_INDEX_SCALE * index * 2L);
      }

-    private static final sun.misc.Unsafe unsafe = 
sun.misc.Unsafe.getUnsafe();
+    private static final jdk.internal.misc.Unsafe unsafe = 
jdk.internal.misc.Unsafe.getUnsafe();
  }

-Chris.