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[MemorySSA] Check for unreachable blocks when getting last definition.

Authored by asbirlea on Oct 1 2019, 12:09 PM.

Description

[MemorySSA] Check for unreachable blocks when getting last definition.

If a single predecessor is found, still check if the block is
unreachable. The test that found this had a self loop unreachable block.
Resolves PR43493.

llvm-svn: 373383

Details

Committed
asbirleaOct 1 2019, 12:09 PM
Parents
rG7ed4fb389bab: Add a missing pass in ARM O3 pipeline
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