ldscripts/empty-address vs. xcoff

The empty-address tests check that if a section is removed by ld due
to being empty then properties of that section don't affect following
addresses.  The xcoff backend doesn't remove the empty .data section
created by empty-address-2* and empty-address-3* for some reason, and
therefore fails the test.

	* testsuite/ld-scripts/empty-address-1.d: Accept more symbols.
	* testsuite/ld-scripts/empty-address-2a.d: xfail for xcoff.
	* testsuite/ld-scripts/empty-address-2b.d: Likewise.
	* testsuite/ld-scripts/empty-address-3a.d: Likewise.
	* testsuite/ld-scripts/empty-address-3b.d: Likewise.

ld/testsuite/ld-scripts/empty-address-1.d

@@ -5,5 +5,6 @@
 0+0 [AT] _start
 #...
 0+200 [ADT] __data_end
+#...
 0+200 [ADT] __data_start
 #pass

ld/testsuite/ld-scripts/empty-address-2a.d

@@ -1,7 +1,7 @@
 #source: empty-address-2.s
 #ld: -Ttext 0x0000000 -Tdata 0x200 -T empty-address-2a.t
 #nm: -n
-#xfail: bfin-*-linux* frv-*-*linux* riscv64*-*-* tic54x-*-*
+#xfail: bfin-*-linux* frv-*-*linux* riscv64*-*-* tic54x-*-* [is_xcoff_format]
 #...
 0+0 T _start
 #...

ld/testsuite/ld-scripts/empty-address-2b.d

@@ -1,7 +1,7 @@
 #source: empty-address-2.s
 #ld: -Ttext 0x0000000 -Tdata 0x200 -T empty-address-2b.t
 #nm: -n
-#xfail: bfin-*-linux* frv-*-*linux* riscv64*-*-* tic54x-*-*
+#xfail: bfin-*-linux* frv-*-*linux* riscv64*-*-* tic54x-*-* [is_xcoff_format]
 #...
 0+0 T _start
 #...

ld/testsuite/ld-scripts/empty-address-3a.d

@@ -1,6 +1,7 @@
 #source: empty-address-3.s
 #ld: -T empty-address-3a.t
 #nm: -n
+#xfail: [is_xcoff_format]
 
 #...
 0+0 T _start

ld/testsuite/ld-scripts/empty-address-3b.d

@@ -1,6 +1,7 @@
 #source: empty-address-3.s
 #ld: -T empty-address-3b.t
 #nm: -n
+#xfail: [is_xcoff_format]
 
 #...
 0+0 T _start