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[GVNHoist] Prune out useless CHI insertions

Description

[GVNHoist] Prune out useless CHI insertions

Fix for the out-of-memory error when compiling SemaChecking.cpp
with GVNHoist and ubsan enabled. I've used a cache for inserted
CHIs to avoid excessive memory usage.

Differential Revision: https://reviews.llvm.org/D50323

Details

Committed
alelab01Aug 28 2018, 4:07 AM
Differential Revision
D50323: [GVNHoist] Prune out useless CHI insertions
Parents
rL340817: [NFC] Apply another commit to comply with old CMake
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