[flang][driver] Add options -fdefault-integer-4 and -fdefault-real-4 These options are supported by the Intel compiler. There are similar options in the IBM compiler as well. Each of the options can be provided more than once. In that case, the last occurence of -fdefault-real-* (respectively -fdefault-integer-*) is used if both -fdefault-real-4 and -fdefault-real-8 are specified. The fdefault.f90 test file was extensively modified. Testing handling of the options by the driver was removed since testing handling of the options by -fc1 is sufficient. Fixes #160252
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