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Summary: Comparing against the empty string should generate much better code that what it does today. We can also generate better code when comparing against literals that are larger than the SSO space. Reviewers: EricWF Subscribers: christof, jdoerfert, libcxx-commits Tags: #libc Differential Revision: https://reviews.llvm.org/D59781 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@357614 91177308-0d34-0410-b5e6-96231b3b80d8