Integrate llvm/llvm-project@778e104d (#22741)

- Still carrying revert from last week
llvm/llvm-project#162930
- New reverts of llvm/llvm-project#168933 and
llvm/llvm-project#168928 because of bazel build
failure. There are some discussions on discord
https://discord.com/channels/689900678990135345/1080178290188374049/1442537425086709772.

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Signed-off-by: yzhang93 <[email protected]>

Author: yzhang93