Switch between source and disassembly

[bonefish]

Sometimes it can be helpful to have a look at the disassembly of the current function, even when the source code is available. An option to switch between source code and disassembly would be nice.

[anevilyak]

From a quick look, the only real hurdle to implementing this is that FunctionSourceCodeRequested() will always preferentially load the actual source if available and will skip disassembly entirely if that's the case. I'd propose simply adding an optional boolean parameter to the latter to explicitly override that behavior and force loading disassembly, so that SourceView can make use of that to request it if not yet available.

[anevilyak]

Implemented in hrev45778.