[HLSL][DirectX] Add the Qdx-rootsignature-strip driver option (#154454)
This pr adds the `Qstrip-rootsignature` as a `DXC` driver option.
To do so, this pr introduces the `BinaryModifyJobClass` as an `Action`
to modify a produced object file before its final output.
Further, it registers `llvm-objcopy` as the tool to modify a produced
`DXContainer` on the `HLSL` toolchain.
This allows us to specify the `Qstrip-rootsignature` option to
`clang-dxc` which will invoke `llvm-objcopy` with a
`--remove-section=RTS0` argument to implement its functionality.
Resolves: https://github.com/llvm/llvm-project/issues/150275.
llvm-project
74a4d815 - [HLSL][DirectX] Add the Qdx-rootsignature-strip driver option (#154454)
