registrationRANSACBasedOnFeatureMatching crashed if built with openmp

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**Describe the bug**
when compiling open3d with openmp support, registrationRANSACBasedOnFeatureMatching method crashed offen. I recompiled open3d with -DWITH_OPENMP=OFF, then it worked fine

**To Reproduce**
Steps to reproduce the behavior:

I am using open3d in cpp

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
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**Environment (please complete the following information):**

- Operating system: ubuntu18
- Python version: (e.g. Python 3.6)
- Open3D version:0.10
- Is this remote workstation?: docker
- How did you install Open3D?: build from source with:
```
RUN cd /Open3D && ./util/scripts/install-deps-ubuntu.sh assume-yes && mkdir build && cd build && cmake .. -DBUILD_PYTHON_MODULE=OFF -DBUILD_SHARED_LIBS=ON -DGLIBCXX_USE_CXX11_ABI=ON && make -j16 && make install
```
- Compiler version (if built from source): gcc 7.5

**Additional context**
Add any other context about the problem here.