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
8725400921