[lldb][asan] Mark destructor as virtual to allow subclasses.
`lldb_private::ScriptInterpreterPython::CommandDataPython` inherits from `lldb_private::BreakpointOptions::CommandData`, but the latter does not have a virtual destructor. This leads to a new-delete-type-mismatch error when running certain tests (such as `functionalities/breakpoint/breakpoint_command/TestBreakpointCommand.py`) under asan.
[NFC] Expose the -Oz module optimization pipeline to opt
This exposes the module optimization pipeline as a pass that can be applied stand-alone when using 'opt'. This helps ml inliner training scenarios, where we start with IR captured right before inlining, perform the inlining (-scc-oz-module-inliner) and then want to continue and observe the final IR (where this patch comes into play). We can then apply llc on the resulting IR to continue compilation down to native.