Some cleanups in RTLIL::SigChunk::SigChunk(const RTLIL::Const&)
Refactoring {SigSpec|SigChunk}(RTLIL::Wire *wire, ..) constructor -- step 1/3
Refactoring {SigSpec|SigChunk}(RTLIL::Wire *wire, ..) constructor -- step 2/3
Refactoring {SigSpec|SigChunk}(RTLIL::Wire *wire, ..) constructor -- step 3/3
Merge branch: Refactoring {SigSpec|SigChunk}(RTLIL::Wire *wire, ..) constructor