librustc: Stop zeroing out allocas so much. Cuts 300K off librustc.#4686

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pcwalton wants to merge 3 commits intorust-lang:incomingfrom

pcwalton:zero-allocas

Commits on Jan 30, 2013

librustc: De-export some of trans. rs=deexporting
pcwalton
committed
librustc: Strdup unique strings instead of copying in byte by byte. Shaves 2MB off librustc at -O0.
pcwalton
committed
librustc: Stop zeroing out allocas so much. Cuts 300K off librustc.
pcwalton
committed