Bug 1017852 - Make the jit and C++ nursery full check the same; r=jonco

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extra : rebase_source : b73694b64380770ff400a8b8eaec9fa265a8e126
Bug 961412 - Back out the hack in bug 849526 now that exact rooting has landed; r=jandem

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extra : rebase_source : 51eca9d463f40b1c8d3c37cbb34ab70b3a9e4c43
Bug 1013531 - Clarify the naming of the rooting analysis supression guards; r=sfink

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extra : rebase_source : 95229e907222dd7335f92ae13dd83f1065eabf58