NEW 173929
LLint ARM64 assembler can't compare and branch with SP as second operand 
https://bugs.webkit.org/show_bug.cgi?id=173929
Summary LLint ARM64 assembler can't compare and branch with SP as second operand
JF Bastien
Reported 2017-06-28 10:23:50 PDT
See build break in: https://bugs.webkit.org/show_bug.cgi?id=173922 `subs xzr, x1, sp` isn't a valid instruction in ARM64. arm64.rb should know how to flip operands and condition if the last operand is sp.
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