Merge pull request #874 from xlpiao/DescriptorSet-and-Binding

HLSL: Manually configure descriptor set and binding number for resources

diff --cc glslang/MachineIndependent/iomapper.cpp
Simple merge

diff --cc glslang/MachineIndependent/localintermediate.h
Simple merge

diff --cc gtests/Hlsl.FromFile.cpp
Simple merge

diff --cc hlsl/hlslParseHelper.cpp
Simple merge