Summary:
libstdc++ has some undefined behavior in bits/stl_tree.h that
has recently became excercised by some of the LLVM code.
Given that fixing libstdc++ will take years, adding the file
into a blacklist to fix bots seems like a necessity.
Reviewers: vitalybuka
Subscribers: llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D28686
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291918 91177308-0d34-0410-b5e6-96231b3b80d8
