xtensa: use unwind-dw2-fde-dip instead of unwind-dw2-fde

This allows having exception cleanup code in binaries that don't
register their unwind tables.

2015-08-18  Max Filippov  <jcmvbkbc@gmail.com>
libgcc/
	* config/xtensa/t-windowed (LIB2ADDEH): Replace unwind-dw2-fde
	with unwind-dw2-fde-dip.

From-SVN: r226963

libgcc/ChangeLog

 2015-08-18  Max Filippov  <jcmvbkbc@gmail.com>
 
+	* config/xtensa/t-windowed (LIB2ADDEH): Replace unwind-dw2-fde
+	with unwind-dw2-fde-dip.
+
+2015-08-18  Max Filippov  <jcmvbkbc@gmail.com>
+
 	* config/xtensa/lib2funcs.S (__xtensa_libgcc_window_spill): Use
 	CALL12 followed by series of ENTRY to spill windowed registers.
 	(__xtensa_nonlocal_goto): Call __xtensa_libgcc_window_spill

libgcc/config/xtensa/t-windowed

 LIB2ADDEH = $(srcdir)/config/xtensa/unwind-dw2-xtensa.c \
-   $(srcdir)/unwind-dw2-fde.c $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
+   $(srcdir)/unwind-dw2-fde-dip.c $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c