[PATCH] [cmake] Unbreak LLVM-Config.cmake / llvm_expand_dependencies

[Peter Zotov]

Hi chandlerc,

The algorithm for sorting libraries in topological order, as
previously implemented, had a few issues:
  * It didn't make any sense.
  * It didn't actually sort libraries in topological order.
  * It hung on some inputs, e.g. "LLVMipo".

This commit replaces the old algorithm with a straightforward port
from llvm-config.cpp.

http://reviews.llvm.org/D6099

Files:
  cmake/modules/LLVM-Config.cmake
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