[llvm][IRBuilder] Introspection for CreateAlignmentAssumption*() functions
Summary:
Clang calls these functions to produce IR for assume-aligned attributes.
I would like to teach UBSAN to verify these assumptions.
For that, i need to access the final pointer on which the check is performed,
and the actual `icmp` that does the check.
The alternative to this would be to fully re-implement this in clang.
This is a second commit, the original one was r351104,
which was mass-reverted in r351159 because 2 compiler-rt tests were failing.
Reviewers: spatel, dneilson, craig.topper, dblaikie, hfinkel
Reviewed By: hfinkel
Subscribers: hfinkel, llvm-commits
Differential Revision: https://reviews.llvm.org/D54588
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351176
91177308-0d34-0410-b5e6-
96231b3b80d8
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