[clang][Driver] Support -fms-volatile as equivalent to /volatile:ms (#74790)

The flag -fms-volatile has existed as a -cc1 flag for a while. It also
technically existed as a driver flag, but didn't do anything because it
wasn't wired up to anything in the driver.

This patch adds -fno-ms-volatile, and makes both -fms-volatile and
-fno-ms-volatile work the same way as the cl-mode flags. The defaults
are unchanged (default on for x86 in cl mode, default off otherwise).