Bump minimum toolchain version
Summary:
The RFC on moving past C++11 got good traction:
http://lists.llvm.org/pipermail/llvm-dev/2019-January/129452.html
This patch therefore bumps the toolchain versions according to our policy:
llvm.org/docs/DeveloperPolicy.html#toolchain
Subscribers: mgorny, jkorous, dexonsmith, llvm-commits, mehdi_amini, jyknight, rsmith, chandlerc, smeenai, hans, reames, lattner, lhames, erichkeane
Differential Revision: https://reviews.llvm.org/D57264
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352951
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