We got rid of the rounding mode here so that the hermetic tests wouldn't
depend on the system fenv.h. But this seemed to cause some bots to
break. Getting rid of this change for now, it should be fine for the CPU
builds.
Differential Revision: https://reviews.llvm.org/D149767
This changes the `stdlib` tests to the new `add_libc_test` framework.
This applies to all but the exit tests.
Depends on D149691
Reviewed By: sivachandra, michaelrj
Differential Revision: https://reviews.llvm.org/D149705