* gcj/javaprims.h (_Jv_FormatInt):  New declaration.
	* java/lang/natString.cc (_JvFormatInt):  New primitive, with logic
	taken from old Integer.toString code.
	(Integer::valueOf):  Use _Jv_FormatInt.
	* java/lang/Integer.java (toString):  Just use call String.valueOf.
	* java/lang/Long.java (toString):  Fix typo in comment.
	* java/lang/String.java (valueOf(int)):  Make native.
	* java/lang/StringBuffer.java (append(int)):  Make native.
	* java/lang/natStringBuffer.cc:  New file, for append(jint).
	* Makefile.am (ant_source_files):  Add java/lang/natStringBuffer.cc.

From-SVN: r42419