[gdb/testsuite] Use non-capturing parentheses for inferior_exited_re

The inferior_exited_re regexp uses capturing parentheses by default:
...
set inferior_exited_re "(\\\[Inferior \[0-9\]+ \\(.*\\) exited)"
...

The parentheses are there to be able to use the expression as an atom, f.i.,
to have '+' apply to the whole regexp in "${inferior_exited_re}+".

But the capturing is not necessary, and it can be confusing because it's not
obvious in a regexp using "$inferior_exited_re (bla|bli)" that the first
captured expression is in $inferior_exited_re.

Replace by non-capturing parentheses.  If we still want to capture the
expression, we can simply (and more clearly) use "($inferior_exited_re)".

Build and reg-tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-04  Tom de Vries  <tdevries@suse.de>

	* lib/gdb.exp (inferior_exited_re): Use non-capturing parentheses.

Change-Id: I7640c6129b1ada617424d6a63730d4b119c58ef3

2 files changed, 5 insertions, 1 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 2b1a8ba..bc61679 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2020-02-04  Tom de Vries  <tdevries@suse.de>
+
+	* lib/gdb.exp (inferior_exited_re): Use non-capturing parentheses.
+
 2020-02-03  Rogerio A. Cardoso  <rcardoso@linux.ibm.com>
 
 	* gdb.arch/powerpc-power8.exp: Delete trailing whitespace of
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 2d230b7..25bed76 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -117,7 +117,7 @@ if ![info exists env(EXEEXT)] {
 
 set octal "\[0-7\]+"
 
-set inferior_exited_re "(\\\[Inferior \[0-9\]+ \\(.*\\) exited)"
+set inferior_exited_re "(?:\\\[Inferior \[0-9\]+ \\(.*\\) exited)"
 
 # A regular expression that matches a value history number.
 # E.g., $1, $2, etc.