[InterleavedAccessAnalysis] Fix integer overflow in insertMember.
Without checking for integer overflow, invalid members can be added
e.g. if the calculated key overflows, becomes positive and the largest key.
This fixes
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7560
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13128
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13229
Reviewers: Ayal, anna, hsaito, efriedma
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D55538
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355613
91177308-0d34-0410-b5e6-
96231b3b80d8
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