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Commit ac8bc12c authored by Argyrios Kyrtzidis's avatar Argyrios Kyrtzidis
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Add asserts in StringRef to make sure we avoid undefined behavior: 

-strlen should not be called with NULL. Also guarantee that StringRef's Length is 0 if Data is NULL.
-memcmp should not be called with NULL (even if size is 0)

Patch by Matthieu Monrocq!

llvm-svn: 131747
parent 91f1d247
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