Summary:
There is no purpose in splitting out the Error class from the rest of
the StreamExecutor code. This organization was just a vestige of an old
failed design.
Plus, this change fixes a bug in the build where the utilites library
was not being statically linked in with libstreamexecutor.
Reviewers: jlebar, jprice
Subscribers: beanz, parallel_libs-commits
Differential Revision: https://reviews.llvm.org/D24434
llvm-svn: 281118