[CodeGenCXX] Emit strip.invariant.group with -fstrict-vtable-pointers
Summary:
Emmiting new intrinsic that strips invariant.groups to make
devirtulization sound, as described in RFC: Devirtualization v2.
Reviewers: rjmccall, rsmith, amharc, kuhar
Subscribers: llvm-commits, cfe-commits
Differential Revision: https://reviews.llvm.org/D47299
Co-authored-by: Krzysztof Pszeniczny <krzysztof.pszeniczny@gmail.com>
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@336137
91177308-0d34-0410-b5e6-
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