Allow setting of a --simulator parameter when running tests....

Allow setting of a --simulator parameter when running tests.
Passing "--simulator=arm" has the same effect as setting
"-S simulator=arm --arch=arm" and closely mirrors the behavior
of the scons build causing less confusion when running tests.

Committed: http://code.google.com/p/v8/source/detail?r=221

[iposva, 2008-09-09 04:54:53]

Christian,

While the main reason for this change was to simplify testing with the ARM
simulator, you should also be able to reuse some of this to address the issue
you and Mads discussed about distinguishing the simulator and real HW test runs
in the test status files.

Cheers,
-Ivan