docker build fails

```
[206/773] Building CXX object third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/ccp_pass.cpp.o
FAILED: third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/ccp_pass.cpp.o
/usr/bin/c++ -DSPIRV_CHECK_CONTEXT -DSPIRV_COLOR_TERMINAL -DSPIRV_LINUX -DSPIRV_TIMER_ENABLED -I../third_party/spirv-tools -I../third_party/spirv-tools/include -I../third_party/spirv-headers/include -Ithird_party/spirv-tools -Wimplicit-fallthrough -O3 -DNDEBUG -fPIC -Wextra-semi -w -Wall -Wextra -Wnon-virtual-dtor -Wno-missing-field-initializers -Werror -std=c++11 -fno-exceptions -fno-rtti -Wno-long-long -Wshadow -Wundef -Wconversion -Wno-sign-conversion -std=gnu++11 -MD -MT third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/ccp_pass.cpp.o -MF third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/ccp_pass.cpp.o.d -o third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/ccp_pass.cpp.o -c ../third_party/spirv-tools/source/opt/ccp_pass.cpp
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
[207/773] Building CXX object third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/cfg_cleanup_pass.cpp.o
[208/773] Building CXX object third_party/spirv-tools/source/CMakeFiles/SPIRV-Tools.dir/val/validation_state.cpp.o
[209/773] Building CXX object third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/build_module.cpp.o
[210/773] Building CXX object third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/block_merge_pass.cpp.o
[211/773] Building CXX object third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/block_merge_util.cpp.o
[212/773] Building CXX object third_party/spirv-tools/test/reduce/CMakeFiles/test_reduce.dir/operand_to_undef_test.cpp.o
[213/773] Building CXX object third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/basic_block.cpp.o
[214/773] Building CXX object third_party/spirv-tools/test/reduce/CMakeFiles/test_reduce.dir/operand_to_constant_test.cpp.o
[215/773] Building CXX object third_party/spirv-tools/source/opt/CMakeFiles/SPIRV-Tools-opt.dir/aggressive_dead_code_elim_pass.cpp.o
ninja: build stopped: subcommand failed.
```