[PATCH] D32378: Insert invariant.group.barrier for pointers comparisons

[Piotr Padlewski via Phabricator via cfe-commits]

Prazek updated this revision to Diff 96371.
Prazek added a comment.

Don't add barrier if compared with nullptr. With this it reduces added 
barriers to compares by half. Note that we will transform barrier(null) -> barrier
in llvm


https://reviews.llvm.org/D32378

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

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