debuginfo: Some refactoring and fix for #8670#8684

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michaelwoerister wants to merge 2 commits intorust-lang:masterfrom

michaelwoerister:stepping_and_scope_fixes

Commits on Aug 22, 2013

debuginfo: Big cleanup refactoring and support for foreign_item_fn.
michaelwoerister
committed
debuginfo: Improved handling of function preludes.
michaelwoerister
committed