Some tests really are only intended for a specific -std mode, so add a
target selector to make that explicit.
Also reorder the dg-do directives to come after the dg-options ones, so
that the target selector in the dg-do directive is applied after the
dg-options that sets the -std option.
libstdc++-v3/ChangeLog:
* testsuite/20_util/reference_wrapper/83427.cc: Adjust
effective-target to specific language mode only.
* testsuite/24_iterators/headers/iterator/range_access_c++11.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/range_access_c++14.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/synopsis_c++11.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/synopsis_c++14.cc:
Likewise.
* testsuite/26_numerics/valarray/69116.cc:
Likewise.
* testsuite/30_threads/headers/condition_variable/std_c++0x_neg.cc:
Remove whitespace at end of file.
* testsuite/30_threads/headers/future/std_c++0x_neg.cc:
Likewise.
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