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[Driver][test] Avoid undefined grep in darwin-ld.c
Summary: question-mark is not a BRE special character. POSIX.1-2017 XBD Section 9.3.2 indicates that the interpretation of `\?` as used by rC366282 is undefined. This patch uses an ERE instead. Reviewers: rnk, daltenty, xingxue, jasonliu Reviewed By: rnk Subscribers: cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D65668 llvm-svn: 367709
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