tree f3facf847f4c6a6232a0d868596c7ab1414e5e6e
parent c1f45048b90a85018c6b063c31bc088dc3dd993d
author buzbee <buzbee@google.com> 1316667129 -0700
committer buzbee <buzbee@google.com> 1316667129 -0700

Move null checks to bvector utility callers

It's generally ok to encounter basic blocks with no interesting
dataflow info, but better to skip in the callers of the utilities
than in the utilities themselves (to make it explicit).

Change-Id: I27b2c774381d4315d51436527ddf0378e5c05d32