build: update llvm tag to 3a020527 #1717
Merged
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Summary of changes:
Replace
llvm::None
withstd::nullopt
, since the former is deprecated(https://reviews.llvm.org/D139763)
Use setter for symbol visibility instead of passing string attribute when
creating FuncOp
@powderluv @silvasean I am not sure if these changes are sufficient, since the ./build_tools/update_*.sh scripts fail at my end, but most of the lit and e2e tests pass. If the build fails, feel free to take over.