[PATCH] D31830: Emit invariant.group.barrier when using union field

[Piotr Padlewski via Phabricator via cfe-commits]

Prazek updated this revision to Diff 100621.
Prazek added a comment.

Add test


https://reviews.llvm.org/D31830

Files:
  lib/CodeGen/CGExpr.cpp
  test/CodeGenCXX/strict-vtable-pointers.cpp

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