[REQUEST] Enable Diff views base on compiler common features

I wanted to compare the diffs are 2 abstract syntax trees but the diff viewer only supports diff viewers on the assembley and compiler/execution stdout/stderr

It would be nice if you are using 2 compiles that both support extra outputs to be able to diff against those. e.g. if you were using a clang based compiler for both compilations you could diff the optimization, ast or ir output. Likewise if you were using gcc based compilers you could compare the RTL dump.

For implementing this you'd need to check what what output style both compilers selected for a diff support, then populate the diff viewer dropdowns with the extra options