All glory to address sanitizer. ;]
All glory to address sanitizer. ;]

It appears to have caught a use-after-free introduced as by r159567
and/or friends which call 'addPass' from many more places. The bug in
'addPass' doesn't appear to be new, and was spotted by inspection when
ASan shown a bright light of a stacktrace at these functions.

Hopefully this will fix the ASan failure -- I have no test case other
than running an ASan-built clang over the test suite.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@159614 91177308-0d34-0410-b5e6-96231b3b80d8

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