[PATCH] Add a flag to experiment with outlining optional branches.

[Daniel Jasper]

As previously discussed on IRC, using the post dominator tree is probably not an option for performance reasons. I'll try to come up with an implementation that doesn't need it. If we had it, the implementation can actually be simplified as in this version of the patch (a single lookup in the dominator tree instead of many). Just adding this for documentation of the progress.


http://reviews.llvm.org/D7719

Files:
  lib/CodeGen/MachineBlockPlacement.cpp
  test/CodeGen/X86/code_placement_outline_optional_branches.ll

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