Jim Ingham 7fa7dc36fe Take the API lock in SBThread::IsValid & SBFrame::IsValid. ...

The IsValid calls can try to reconstruct the thread & frame, which can 
take various internal locks.  This can cause A/B locking issues with
the Target lock, so these calls need to that the Target lock.

llvm-svn: 268828

2016-05-07 00:54:56 +00:00

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