[PATCH] [opt] Replace the recursive walk for GC with a worklist algorithm.

[David Majnemer]

================
Comment at: COFF/Writer.cpp:118
@@ +117,3 @@
+  // as we push, so sections never appear twice in the list.
+  SmallVector<SectionChunk *, 16> Worklist;
+
----------------
Realistically, won't we always blow out this SmallVector?

http://reviews.llvm.org/D10790

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