e28cd75a50
This reapplies 71d7fed3bc2ad6c22729d446526a59fcfd99bd03 which was reverted by 3e2bd82f02c6cbbfb0544897c7645867f04b3a7e. This change includes the fix for breaking the sanitizer bots. As seen in https://bugs.llvm.org/show_bug.cgi?id=48880 the current implementation for parsing grouped short options can return unclear error messages. This change fixes the example given in the ticket in which a flag is incorrectly given an argument. Also when parsing a group we now keep reading past the first incorrect option and output errors for all incorrect options in the group. Differential Revision: https://reviews.llvm.org/D108770