Some tests from 'import-std-module' used to fail on the builder
https://lab.llvm.org/staging/#/builders/195/builds/4470,
since libcxx is set up to be linked statically with test binaries
on it.
Thus, they were temporarily disabled in #112530. Here, this commit
is reverted.
Jitted expressions from the tests try to call __libcpp_verbose_abort
function that is not present in the process image, which causes
the failure.
Here, this symbol is explicitly referenced from the test source files.
61e2841d8b