refactoring: Kill ref cycle in librustc trans#21024

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pnkfelix wants to merge 2 commits intorust-lang:masterfrom

pnkfelix:kill-ref-cycle-in-librustc_trans

Commits on Jan 20, 2015

Refactored librustc_trans to avoid stack-crossing ref cycle.
pnkfelix
committed
librustc_trans: accommodate `make tidy` post cycle-breaking refactoring.
pnkfelix
committed