Tim Northover 3c68c5c55e ARM64: add support for AArch64's addsub_ext.ll
There was one definite issue in ARM64 (the off-by-1 check for whether
a shift could be folded in) and one difference that is probably
correct: ARM64 didn't fold nodes with multiple uses into the
arithmetic operations unless optimising for code size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206168 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-14 12:50:50 +00:00
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