Fix a use-after-RAUW bug in large GEP splitting
Summary:
Large GEP splitting, introduced in rL332015, uses a `DenseMap<AssertingVH<Value>, ...>`. This causes an assertion to fail (in debug builds) or undefined behaviour to occur (in release builds) when a value is RAUWed.
This manifested itself in the 7zip benchmark from the llvm test suite built on ARM with `-fstrict-vtable-pointers` enabled while RAUWing invariant group launders and splits in CodeGenPrepare.
This patch merges the large offsets of the argument and the result of an invariant.group strip/launder intrinsic before RAUWing.
Reviewers: Prazek, javed.absar, haicheng, efriedma
Reviewed By: Prazek, efriedma
Subscribers: kristof.beyls, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D51936
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344802 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed