Improve the LLVM IR we generate for trivial functions, especially #[naked] ones.#40367

Merged

bors merged 2 commits intorust-lang:masterfrom

eddyb:naked-cruft

Apr 13, 2017

Commits on Apr 12, 2017

rustc_trans: don't emit ZST allocas that are only assigned to.
eddyb
committed
rustc_trans: avoid a separate entry BB if START_BLOCK has no backedges.
eddyb
committed