NEW 169823
It's not obvious why addSpillAndFill has to reject storing to wider spill slots 
https://bugs.webkit.org/show_bug.cgi?id=169823
Summary It's not obvious why addSpillAndFill has to reject storing to wider spill slots
Filip Pizlo
Reported 2017-03-17 11:31:06 PDT
The allocateStack fixes up ZDefs that are too narrow, so it seems weird that we need that escape hatch.
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