gdb/testsuite: extend the use of mi_clean_restart

The mi_clean_restart proc calls the mi_gdb_start proc passing no
arguments.

In this commit I add an extra (optional) argument to the
mi_clean_restart proc, and pass this through to mi_gdb_start.

The benefit of this is that we can now use mi_clean_restart when we
also want to pass the 'separate-mi-tty' or 'separate-inferior-tty'
flags to mi_gdb_start, and avoids having to otherwise duplicate the
contents of mi_clean_restart in different tests.

I've updated the obvious places where this new functionality can be
used, and I'm seeing no test regressions.

Reviewed-By: Pedro Alves <pedro@palves.net>

gdb/testsuite/gdb.mi/mi-break.exp

@@ -393,21 +393,15 @@ proc_with_prefix test_forced_conditions {} {
 proc test_break {mi_mode} {
     global srcdir subdir binfile
 
-    mi_gdb_exit
-
     if {$mi_mode == "separate"} {
 	set start_ops "separate-mi-tty"
     } else {
 	set start_ops ""
     }
-    if [mi_gdb_start $start_ops] {
+    if [mi_clean_restart $binfile $start_ops ] {
 	return
     }
 
-    mi_delete_breakpoints
-    mi_gdb_reinitialize_dir $srcdir/$subdir
-    mi_gdb_load ${binfile}
-
     test_tbreak_creation_and_listing
 
     test_ignore_count

gdb/testsuite/gdb.mi/mi-exec-run.exp

@@ -73,7 +73,6 @@ proc test {inftty_mode mi_mode force_fail} {
 
     mi_delete_breakpoints
     mi_gdb_reinitialize_dir $srcdir/$subdir
-    mi_gdb_reinitialize_dir $srcdir/$subdir
     mi_gdb_load ${bin}
 
     # Useful for debugging:

gdb/testsuite/gdb.mi/mi-multi-commands.exp

@@ -38,8 +38,7 @@ proc run_test { args } {
     global mi_gdb_prompt
     global decimal
 
-    gdb_exit
-    if [mi_gdb_start $args] {
+    if [mi_clean_restart "" $args] {
 	return
     }
 

gdb/testsuite/gdb.mi/mi-watch.exp

@@ -150,14 +150,12 @@ proc test_watchpoint_all {mi_mode type} {
 	return
     }
 
-    mi_gdb_exit
-
     if {$mi_mode == "separate"} {
 	set start_ops "separate-mi-tty"
     } else {
 	set start_ops ""
     }
-    if [mi_gdb_start $start_ops] {
+    if [mi_clean_restart ${binfile} $start_ops] {
 	return
     }
 
@@ -170,10 +168,6 @@ proc test_watchpoint_all {mi_mode type} {
 	"567\\^done" \
 	"hw watchpoints toggle"
 
-    mi_delete_breakpoints
-    mi_gdb_reinitialize_dir $srcdir/$subdir
-    mi_gdb_load ${binfile}
-
     mi_runto callee4
     test_watchpoint_creation_and_listing
     #test_rwatch_creation_and_listing

gdb/testsuite/gdb.mi/new-ui-mi-sync.exp

@@ -40,17 +40,11 @@ proc do_test {sync_command} {
     global gdb_spawn_id gdb_main_spawn_id mi_spawn_id inferior_spawn_id
     global gdb_prompt mi_gdb_prompt
 
-    mi_gdb_exit
-
-    if {[mi_gdb_start "separate-mi-tty"] != 0} {
+    if {[mi_clean_restart $binfile "separate-mi-tty"] != 0} {
 	fail "could not start gdb"
 	return
     }
 
-    mi_delete_breakpoints
-    mi_gdb_reinitialize_dir $srcdir/$subdir
-    mi_gdb_load $binfile
-
     # Start a synchronous run/continue on the MI UI.
     set test "send synchronous execution command"
     if {$sync_command == "run"} {

gdb/testsuite/gdb.mi/user-selected-context-sync.exp

@@ -396,22 +396,16 @@ proc_with_prefix test_setup { mode } {
 
     set any "\[^\r\n\]*"
 
-    mi_gdb_exit
-
     save_vars { GDBFLAGS } {
 	if { $mode == "non-stop" } {
 	    set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop 1\""]
 	}
 
-	if { [mi_gdb_start "separate-mi-tty"] != 0 } {
+	if { [mi_clean_restart $binfile "separate-mi-tty"] != 0 } {
 	    return -1
 	}
     }
 
-    mi_delete_breakpoints
-    mi_gdb_reinitialize_dir $srcdir/$subdir
-    mi_gdb_load $binfile
-
     if { [mi_runto_main] < 0 } {
 	return -1
     }

gdb/testsuite/lib/mi-support.exp

@@ -1012,7 +1012,7 @@ proc mi_run_with_cli {args} {
 # EXECUTABLE is the basename of the binary.
 # Return -1 if starting gdb or loading the executable failed.
 
-proc mi_clean_restart {{executable ""}} {
+proc mi_clean_restart {{executable ""} {flags {}}} {
     global srcdir
     global subdir
     global errcnt
@@ -1024,7 +1024,7 @@ proc mi_clean_restart {{executable ""}} {
     set errcnt 0
     set warncnt 0
 
-    if {[mi_gdb_start]} {
+    if {[mi_gdb_start $flags]} {
 	return -1
     }