re PR libgcj/27171 (UTF8 PrintWriter goes haywire)

PR libgcj/27171:
	* testsuite/libjava.lang/pr27171.java: New file.
	* testsuite/libjava.lang/pr27171.out: New file.
	* gnu/gcj/convert/Output_UTF8.java (havePendingBytes): Return
	true if we've seen a high surrogate.
	(write): Handle high surrogates at the end of the stream.
	Properly emit isolated low surrogates.

From-SVN: r113013

libjava/testsuite/libjava.lang/pr27171.java

@@ -0,0 +1,19 @@
+public class pr27171 {
+
+	public static void main(String[] args) throws Throwable {
+	  // Isolated low surrogate.
+	  char x = 56478;  // 0xdc9e
+	  String xs = new String(new char[] { x });
+	  // Note that we fix a result for our implementation; but
+	  // the JDK does something else.
+	  System.out.println(xs.getBytes("UTF-8").length);
+
+	  // isolated high surrogate -- at end of input stream
+	  char y = 0xdaee;
+	  String ys = new String(new char[] { y });
+	  // Note that we fix a result for our implementation; but
+	  // the JDK does something else.
+	  System.out.println(ys.getBytes("UTF-8").length);
+	}
+}
+

libjava/testsuite/libjava.lang/pr27171.out

@@ -0,0 +1,2 @@
+3
+3