Bug 1400442 - Fix handling of parameterNames, r=jonco

This is for nicer output only, and does not affect the computation. A WorkListEntry contains a stack of CallSites, and the top of the stack represents the entry itself and so should share parameterNames. This changes fixes cases where some names were being registered in a different table than ended up being used by printouts.

--HG--
extra : rebase_source : e52bbc9ab3e4596d748ca2d729772a61cde1430a