[ubsan] Extend the nonnull arg check to ObjC
UBSan's nonnull argument check applies when a parameter has the "nonnull" attribute. The check currently works for FunctionDecls, but not for ObjCMethodDecls. This patch extends the check to work for ObjC. Differential Revision: https://reviews.llvm.org/D30599 llvm-svn: 296996
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