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Fix a crash in option parsing.

Description

Fix a crash in option parsing.

The call to getopt_long didn't handle the case where the *last* option
had an argument missing.

rdar://problem/51231882

Differential Revision: https://reviews.llvm.org/D63110

Details

Committed
adrianJun 11 2019, 2:14 PM
Differential Revision
D63110: Fix a crash in option parsing.
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