Tell the debugger the path to the WebKit source tree when saving a crash log

Tell the debugger the path to the WebKit source tree when saving a crash log

This allows the debugger to include the crashing line of code in the log.

Fixes <http://webkit.org/b/53678> Crash logs from buildslaves don't show the crashing line
of code

Reviewed by Sam Weinig.

* Scripts/old-run-webkit-tests:
(createDebuggerCommandFile): Added. Saves commands that we'd like the debugger to run to a
file and returns the path to that file. The commands we pass came from
setUpWindowsCrashLogSaving, but I've added a .srcpath command to tell the debugger where the
WebKit source code lives.
(setUpWindowsCrashLogSaving): Instead of specifying the commands directly on the command
line using -c, save them to a file and specify the path to that file using -cf. This works
around what is presumably a bug in Windows's command line parsing, where having multiple
quoted paths in the debugger commands causes the post-mortem debugger not to be invoked at
all. Also pulled the options we pass to the debugger out into a list that is then join()ed
together to make them easier to modify in the future.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@77515 268f45cc-cd09-0410-ab3c-d52691b4dbfc