When a test fails the exit code of the process is printed
in the logs in the decimal format. On Windows searching for
the actual error is pretty difficult in this format since
we are dealing with negative values errors.
We print now the hex format of the same exit value next to
the original one.

Example failure of a test:
https://ci.chromium.org/p/v8/builders/try/v8_win64_dbg/b8897355488287117696
https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8897355488287117696/+/steps/Check/0/stdout
https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8897355488287117696/+/steps/Check/0/logs/RunWasmInterpreter_Int32Const_many/0

Bug: v8:9810
Change-Id: I51b65d6105bda6516707a764dbd41fd36c9dfc80
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1903975
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64878}