Add a flag to experiment with outlining optional branches.

Add a flag to experiment with outlining optional branches.

In a CFG with the edges A->B->C and A->C, B is an optional branch.

LLVM's default behavior is to lay the blocks out naturally, i.e. A, B,
C, in order to improve code locality and fallthroughs. However, if a
function contains many of those optional branches only a few of which
are taken, this leads to a lot of unnecessary icache misses. Moving B
out of line can work around this.

Review: http://reviews.llvm.org/D7719

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231230 91177308-0d34-0410-b5e6-96231b3b80d8