LoongArch: Enforce 4-byte align for machine instructions

[Alan Modra]

readelf output is different for 32-bit objects.  Fix the test for
loongarch32 by not overspecifying the match.

diff --git a/gas/testsuite/gas/loongarch/insn_align_4.d b/gas/testsuite/gas/loongarch/insn_align_4.d
index 31a5d352a76..4c2e909d959 100644
--- a/gas/testsuite/gas/loongarch/insn_align_4.d
+++ b/gas/testsuite/gas/loongarch/insn_align_4.d
@@ -1,7 +1,6 @@
 #as:
-#readelf: -S
+#readelf: -W -S
 
 #...
-  \[ [0-9]+\] \.text             PROGBITS         [0-9a-f]{16}  [0-9a-f]{8}
-       [0-9a-f]{16}  [0-9a-f]{16}  AX       0     0     4
-#...
+.* \.text .* 4
+#pass

-- 
Alan Modra