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[TSan] Support Objective-C @synchronized with tagged pointers
Summary: Objective-C employs tagged pointers, that is, small objects/values may be encoded directly in the pointer bits. The resulting pointer is not backed by an allocation/does not point to a valid memory. TSan infrastructure requires a valid address for `Acquire/Release` and `Mutex{Lock/Unlock}`. This patch establishes such a mapping via a "dummy allocation" for each encountered tagged pointer value. Reviewers: dcoughlin, kubamracek, dvyukov, delcypher Reviewed By: dvyukov Subscribers: llvm-commits, #sanitizers Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D56238 llvm-svn: 350556
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