Merge "Remove redundant -Wall,-Wextra, which are already enabled globally" into main am: 79a6a30842 am: 3628d7bafe

Original change: https://android-review.googlesource.com/c/platform/external/llvm/+/3260341

Change-Id: I55acf33bc968835729b350859c4e8c96cbd1341e
Signed-off-by: Automerger Merge Worker <[email protected]>