Misc: Made gdb crash reporting script more automation friendly

* Don't block on successful exit
* Generate timestamped filenames to avoid overwriting old logs

contrib/debugger/crashreport.gdb

@@ -1,5 +1,5 @@
 set logging overwrite on
-set logging file backtrace.log
+set logging file backtrace.log.temp
 set style enabled off
 set height unlimited
 set width unlimited
@@ -9,19 +9,30 @@ set pagination 0
 set logging on
 echo \n--- DEBUG: --- START\n\n
 run
-echo \n--- DEBUG: BACKTRACE FULL\n
-if TrinityAssertionFailedMessage != 0
-  printf "%s\n", TrinityAssertionFailedMessage
+# check if exited normally
+if $_isvoid($_exitcode)
+  echo \n--- DEBUG: BACKTRACE FULL\n
+  # print assertion message if this is ASSERT crash
+  if TrinityAssertionFailedMessage != 0
+    printf "%s\n", TrinityAssertionFailedMessage
+  end
+  echo \n
+  backtrace full
+  echo \n--- DEBUG: INFO REGISTERS\n\n
+  info registers
+  echo \n--- DEBUG: CALLS (x/16i $pc)\n\n
+  x/16i $pc
+  echo \n--- DEBUG: THREAD APPLY ALL BACKTRACE\n
+  thread apply all backtrace
+  echo \n--- DEBUG: --- STOP\n\n
+  echo Generated by crashreport.gdb script version 1.4\n
+  set logging off
+
+  # rename log file to avoid it getting overwritten by restart scripts
+  shell mv backtrace.log.temp backtrace_$(date +%Y-%m-%d-%T).log
+else
+  # normal exit, cleanup temp file
+  set logging off
+  shell rm backtrace.log.temp
 end
-echo \n
-backtrace full
-echo \n--- DEBUG: INFO REGISTERS\n\n
-info registers
-echo \n--- DEBUG: CALLS (x/16i $pc)\n\n
-x/16i $pc
-echo \n--- DEBUG: THREAD APPLY ALL BACKTRACE\n
-thread apply all backtrace
-echo \n--- DEBUG: --- STOP\n\n
-echo Generated by crashreport.gdb script version 1.3\n
-set logging off
 quit