[gdb/testsuite] Minimize gdb restarts

Minimize gdb restarts, applying the following rules:
- don't use prepare_for_testing unless necessary
- don't use clean_restart unless necessary

Also, if possible, replace build_for_executable + clean_restart
with prepare_for_testing for brevity.

Touches 68 test-cases.

Tested on x86_64-linux.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.base/fork-print-inferior-events.exp b/gdb/testsuite/gdb.base/fork-print-inferior-events.exp
index eda0f50..051aeb7 100644
--- a/gdb/testsuite/gdb.base/fork-print-inferior-events.exp
+++ b/gdb/testsuite/gdb.base/fork-print-inferior-events.exp
@@ -34,7 +34,7 @@ if [gdb_debug_enabled] {
 
 standard_testfile
 
-if { [prepare_for_testing "failed to prepare" $testfile $srcfile debug] } {
+if { [build_executable "failed to prepare" $testfile $srcfile debug] } {
     return -1
 }