[Refactoring] Remove unused code for 'symfile'
[Refactoring] Remove unnecessary memset for HdrGenState

It's already done in the default constructor.
[Refactoring] Remove unused fields in HdrGenState
[Refactoring] Remove HdrGenState::console
[Refactoring] Rename FLinit.init to forStmtInit
Merge pull request #3857 from 9rnsr/refactor_unused

[Refactoring] Remove unused code around header generation