* fix multi-thread error of fc_gru_fuse_pass.cc, test=develop

* export FLAGS and GLOG symbols, test=develop

test=develop

test=develop

Add check for it.
test=develop

Fix code to support cpplint syntax check

test=develop

test=develop

test=develop

test=develop

* "avoid copy back to cpu"

* "add infinity support"

* "fix ci"

* "add cpu macro"

* rerun ci; test=develop

* "fix api"
test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop