[llvm-commits] PATCH: Add single entry / single exit accessors

[Andreas Simbuerger]

Hi,

the attached patch adds accessors for single entry / single exit
edges to the regions.

The implementation(s) are copied from Region::isSimple(). A
later patch will change Region::isSimple() to use the accessors instead.

If a single edge cannot be found, null is returned.

Cheers,
Andreas
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