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[DebugInfo] Replace unreachable with None

Authored by JDevlieghere on Mar 12 2018, 7:45 AM.

Description

[DebugInfo] Replace unreachable with None

Invalid user input should not trigger assertions and unreachables. We
already return an Option so we should just return None here.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5532

llvm-svn: 327274

Details