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[KernelAddressSanitizer] Fix globals exclusion for indirect aliases
GlobalAlias::getAliasee() may not always point directly to a GlobalVariable. In such cases, try to find the canonical GlobalVariable that the alias refers to. Link: ClangBuiltLinux/linux#1208 Reviewed By: dvyukov, nickdesaulniers Differential Revision: https://reviews.llvm.org/D92846 (cherry picked from commit c28b18a)
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