Revert r329956, "AArch64: Introduce a DAG combine for folding offsets into addresses."

Caused a hang and eventually an assertion failure in LTO builds
of 7zip-benchmark on aarch64 iOS targets.
http://green.lab.llvm.org/green/job/lnt-ctmark-aarch64-O3-flto/2024/

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330063 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed