Currently, TargetLibraryInfoWrapperPass is inserted by PMBuilder.
However, some passes are inserted manually before the PMBuilder
ones - if any of them happens to use TargetLibraryInfoWrapperPass,
it'll get a default-constructed one, with an unknown target triple.
This happens to InstrProfiling in D21736, breaking it.

Differential Revision: http://reviews.llvm.org/D21737

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@287688 91177308-0d34-0410-b5e6-96231b3b80d8