Handle -Fc in Compile API

[tex3d]

Handle -Fc in Compile API in order to support separate simultaneous disassembly output.

[ghost]

Is this still not resolved in latest version of dxc (it looks like it isn't)? Could anyone update documentation which option works or not when using compile api ? I lost alot of time trying to figure out why -Fc works in stand alone dxc, but not from compile api (E_INVALIDARG was returned). Documentation states that all options are recognized by library calls: https://github.com/microsoft/DirectXShaderCompiler/blob/master/docs/SPIR-V.rst

[damyanp]

Moved to Dormant - we'd happily review a PR that adds support for this, but we're not planning on adding it to DXC.