We should be able to use ARM64 support for LDR with a 32-bit index. 
https://bugs.webkit.org/show_bug.cgi?id=163465
Summary We should be able to use ARM64 support for LDR with a 32-bit index.
Keith Miller
Reported 2016-10-14 16:01:05 PDT
We have two options, we could either make a new "addressing" mode in both Air and MacroAssembler or we could just change the Air and make sure we vet all the existing cases.
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