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...d C `stdatomic.h` headers explicitly incompatible, resulting in a short and easy to understand error message if both are included in the same translation unit. ## LLVM commits * TableGen gained `!foldl` and `!isa` operations, as well as a new `defset` statement. [r326790](http://reviews.llvm.org/rL326790), [r327117](http://reviews.llvm.org/rL327117), [r327121](http://reviews.llvm.org/rL327121). * llvm-mca, the LLVM Machine Code Analyzer tool, has been committed. It an be used to statically estimate the performance of code. [r326998](http://reviews.llvm.org/rL326998). * The syntax for `!foreach` i...