Fix the regression in db05a53a9f41dc87aafed07cc83d1ff22b46d42c/ VMMaker.oscog-eem.2876. Since pinning is potentially a become operation followForwardingPointersInStackZone: is invoked, and that crashes when stackPage is 0, as is it is when snapshotting. So the fix is to return to not pinning in postGCUpdateDisplayBits if snapshotting.
Slang: Fix a regression with inlining isClassOfNonImm:equalTo:compactClassIndex Not quite sure why but an argument assignment for the unused classOop argument was being generated when it shouldn't be.
Cogit: save several lines by inlining wrappers around genTrampolineFor:called:numArgs:arg:arg:arg:arg:regsToSave:pushLinkReg:resultReg:appendOpcodes:. N.B. This breaks translation of the SimpleStackBasedCogit but we don't care. It can be simulation only.
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