[PATCH 08/12] gdb/testsuite: Remove duplicates from gdb.mi/mi-nonstop-exit.exp

[Lancelot SIX <lsix@lancelotsix.com>]

When running the testsuite, I have:

    Running .../gdb/testsuite/gdb.mi/mi-nonstop-exit.exp ...
    DUPLICATE: gdb.mi/mi-nonstop-exit.exp: breakpoint at main
    DUPLICATE: gdb.mi/mi-nonstop-exit.exp: mi runto main

This test runs the same sequence of operations twice.  Refactor the code
by running both of those sequences within a foreach_with_prefix block to
ensure that the commands have unique test names.

There is a slight modification of behaviour introduced by this patch.
mi_delete_breakpoints is called one more time just before quitting gdb,
which is in my opinion is worth given the simplification.

Tested on x86_64-linux.
---
 gdb/testsuite/gdb.mi/mi-nonstop-exit.exp | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/gdb/testsuite/gdb.mi/mi-nonstop-exit.exp b/gdb/testsuite/gdb.mi/mi-nonstop-exit.exp
index 99ac92f15a3..740856ca822 100644
--- a/gdb/testsuite/gdb.mi/mi-nonstop-exit.exp
+++ b/gdb/testsuite/gdb.mi/mi-nonstop-exit.exp
@@ -39,24 +39,16 @@ save_vars { GDBFLAGS } {
 mi_gdb_test "-gdb-set mi-async 1" ".*"
 mi_detect_async
 
-if { [mi_runto_main] < 0 } {
-    continue
-}
-
-mi_send_resuming_command "exec-continue" "continue"
-
-mi_expect_stop "exited-normally" "" "" "" "" "" "finished exec continue"
+foreach_with_prefix iteration {1 2} {
+    if { [mi_runto_main] < 0 } {
+        continue
+    }
 
-# Run the program again.
+    mi_send_resuming_command "exec-continue" "continue"
 
-mi_delete_breakpoints
+    mi_expect_stop "exited-normally" "" "" "" "" "" "finished exec continue"
 
-if { [mi_runto_main] < 0 } {
-    continue
+    mi_delete_breakpoints
 }
 
-mi_send_resuming_command "exec-continue" "continue (2)"
-
-mi_expect_stop "exited-normally" "" "" "" "" "" "finished exec continue (2)"
-
 mi_gdb_exit
-- 
2.33.1