The intrinsic module IEEE_ARITHMETIC must incorporate the public
names from the intrisic module IEEE_EXCEPTIONS. Rename IEEE_EXCEPTIONS
to __Fortran_ieee_exceptions so that it won't clash with the
nonintrinsic namespace, establish a new intrinic IEEE_EXCEPTIONS
module that USEs it, and add a USE to IEEE_ARITHMETIC.
Updated to use STREQUAL rather than ambiguous MATCHES in
the CMakeLists.txt file.
Differential Revision: https://reviews.llvm.org/D121490
0d9b0f642b