Improve compile time and executable size by counting lines of LLVM IR

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This is super awesome. Compile times are for me the absolute worst (other parts of Rust are much better, let's say). I'm totally up for tools to improve this! :smiley:

I'm just giving it a whirl and it seems like it still takes the full compile time to get the pre-LLVM line counts out; is that fundamental somehow? I'm looking at a binary that takes 20mins+ to build in release, and it seems to do a full debug build (352s). Some pretty mental results, though... Awesome data!

Echidnatron% time cargo llvm-lines
   Compiling tpchlike v0.1.0 (file:///Users/mcsherry/Projects/differential-dataflow/tpchlike)
    Finished dev [unoptimized + debuginfo] target(s) in 352.27 secs
1332608 2031  <core::slice::Iter<'a, T>>::search_while
 440031 4621  <core::option::Option<T>>::map
 419929 21396  core::ptr::drop_in_place
 347867  745  alloc::slice::merge_sort
 306676 1394  <alloc::raw_vec::RawVec<T, A>>::double
 219402  745  alloc::slice::insert_head
 208600  745  alloc::slice::merge
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