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[gicombiner] Fix a nullptr dereference when -combiners is given a name that…

Description

[gicombiner] Fix a nullptr dereference when -combiners is given a name that isn't defined

This is unlikely to be the root cause for the windows bot failures but
it would explain the stack trace seen.

Details

Committed
dsandersOct 2 2019, 4:03 PM
Parents
rL373542: [InstCombine] Bypass high bit extract before variable sign-extension (PR43523)
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