[gdb/testsuite] Fix ERROR in gdb.dwarf2/dw2-out-of-range-end-of-seq.exp

When running test-case gdb.dwarf2/dw2-out-of-range-end-of-seq.exp on a
system with debug packages installed, I run into:
...
(gdb) maint info line-table^M
  ... <lots of output> ...
ERROR: internal buffer is full.
UNRESOLVED: gdb.dwarf2/dw2-out-of-range-end-of-seq.exp: \
  END with address 1 eliminated
...

Fix this by limiting the output of the command using a regexp.

I also noticed that when making the regexp match nothing, meaning
the command has no output, the test didn't FAIL.  Fixed this by adding a
PASS pattern.

I also noticed that the FAIL pattern didn't work with -m32, fixed that as
well.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2021-01-28  Tom de Vries  <tdevries@suse.de>

	* gdb.dwarf2/dw2-out-of-range-end-of-seq.exp: Add regexp to
	"maint info line-table".  Make PASS pattern more specific.  Make
	FAIL pattern work for -m32.

2 files changed, 10 insertions, 3 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 814c6de..9256c07 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2021-01-28  Tom de Vries  <tdevries@suse.de>
+
+	* gdb.dwarf2/dw2-out-of-range-end-of-seq.exp: Add regexp to
+	"maint info line-table".  Make PASS pattern more specific.  Make
+	FAIL pattern work for -m32.
+
 2021-01-27  Lancelot SIX  <lsix@lancelotsix.com>
 
 	PR gdb/27133
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp b/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp
index 7a32a01..42cfd0b 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp
@@ -84,11 +84,12 @@ if ![runto_main] {
     return -1
 }
 
-gdb_test_multiple "maint info line-table" "END with address 1 eliminated" {
-    -re -wrap "END *0x0*1 Y \r\n.*" {
+set test "END with address 1 eliminated"
+gdb_test_multiple "maint info line-table $srcfile$" $test {
+    -re -wrap "END *0x0*1 *Y \r\n.*" {
 	fail $gdb_test_name
     }
-    -re -wrap "" {
+    -re -wrap "END *$hex *Y " {
 	pass $gdb_test_name
     }
 }