We still write to the sizeRegister even when we don't have to 
https://bugs.webkit.org/show_bug.cgi?id=172181
Summary We still write to the sizeRegister even when we don't have to
Saam Barati
Reported 2017-05-16 11:51:05 PDT
e.g, when we're signaling.
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Saam Barati
Comment 1 2017-05-16 11:51:39 PDT
And code just assumes it can use the sizeRegister as scratch, so the patchpoint that does the call clobbers the size register. But we should do better here.
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