Fix for arm64 after v8:r26448

The offensive cl is https://codereview.chromium.org/874323003/

Test:
./out/arm64.debug/d8 --test --random-seed=-235865360 --turbo-deoptimization --turbo-filter=* --always-opt --debug-code --verify-heap --gc-interval=500 --stress-compaction test/mjsunit/mjsunit.js test/mjsunit/regress/regress-builtinbust-7.js --trace-deopt

BUG=452067
TBR=dcarney, svenpanne
LOG=n

Review URL: https://codereview.chromium.org/917823002

Cr-Commit-Position: refs/heads/master@{#26593}