Target profile#1

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python3kgae wants to merge 6 commits intomainfrom

Commits on Apr 6, 2022

Add -T for hlsl compiler.
Xiang Li
committed
Include DXC and Core options.
Xiang Li
committed
Cleanup target profile parsing.
Xiang Li
committed
Force OS to shader model for dxc mode.
Xiang Li
committed
Code claneup for isLegalShaderMode.
Xiang Li
committed
Code cleanup.
Xiang Li
committed