llvm::mk_object_file to option type (fixes OS X crash)#1142

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jwise wants to merge 1 commit intorust-lang:masterfrom

jwise:master

Commits on Nov 7, 2011

llvm::mk_object_file should really return an option, since the underlying LLVM function can fail. Fixes a crash on OS X when rust has bad dylibs within eyeshot.
jwise
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