Used SwitchToThread for YIELDING on AMD piledriver with Windows.
Merge branch 'develop' of github.com:xianyi/OpenBLAS into develop
Merge branch 'develop' of github.com:xianyi/OpenBLAS into develop
Merge branch 'develop' of github.com:xianyi/OpenBLAS into develop
Merge branch 'develop' of github.com:xianyi/OpenBLAS into develop