Primarily affects the MIR construction, which indirectly improves LLVM
IR generation, but some LLVM IR changes have been made too.
* Handle "statement expressions" more intelligently. These are
expressions that always evaluate to `()`. Previously a temporary would
be generated as a destination to translate into, which is unnecessary.
This affects assignment, augmented assignment, `return`, `break` and
`continue`.
* Avoid inserting drops for non-drop types in more places. Scheduled
drops were already skipped for types that we knew wouldn't need
dropping at construction time. However manually-inserted drops like
those for `x` in `x = y;` were still generated. `build_drop` now takes
a type parameter like its `schedule_drop` counterpart and checks to
see if the type needs dropping.
* Avoid generating an extra temporary for an assignment where the types
involved don't need dropping. Previously an expression like
`a = b + 1;` would result in a temporary for `b + 1`. This is so the
RHS can be evaluated, then the LHS evaluated and dropped and have
everything work correctly. However, this isn't necessary if the `LHS`
doesn't need a drop, as we can just overwrite the existing value.
* Improves lvalue analysis to allow treating an `Rvalue::Use` as an
operand in certain conditions. The reason for it never being an
operand is so it can be zeroed/drop-filled, but this is only true for
types that need dropping.
The first two changes result in significantly fewer MIR blocks being
generated, as previously almost every statement would end up generating
a new block due to the drop of the `()` temporary being generated.
