Jakob Stoklund Olesen 4f3254f73c Add MachineBasicBlock::isPredecessor().
A->isPredecessor(B) is the same as B->isSuccessor(A), but it can
tolerate a B that is null or dangling. This shouldn't happen normally,
but it it useful for verification code.

llvm-svn: 160968
2012-07-30 17:36:47 +00:00
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