Bug 1005113 - IonMonkey: Mark more LUses as AtStart on x86/x64. r=bhackett
Bug 1005489 - Implement better sub-tree sorting and significance detection in about:memory's diff mode. r=mccr8.

--HG--
extra : rebase_source : 5a157d0ed2f099550aa2b803ac4f6f172b59ba44
Backed out changeset ab7014b5f5cc (bug 1005113) for jit test failures
Bug 1010784: Null out sync loop target to avoid assertions when reusing sync XHR. r=khuey
Bug 965309: Shut down the sync loop, if any, when we shut down the XHR. r=bent
Bug 1014384: Fix 'IPDL code generator generates implementation stubs for pure virtual methods'. r=bent
merge m-c to inbound
Backed out changeset 6c53f6dbb7d0 (bug 1013809) for causing bug 1016498
Backed out changeset efff1d901dca (bug 854421)
Backed out changeset b4f05a5d9d89 (bug 854421)
Backed out changeset cbe947863ad3 (bug 854421)
Backed out changeset 123998cc3f92 (bug 854421)
Backed out changeset 3f58a7521a51 (bug 854421)
Backed out changeset 056cc43a50b6 (bug 854421)
Backed out changeset 1d9f1a4d7838 (bug 854421)
Backed out changeset 743bd08df703 (bug 854421)
Backed out changeset 0ce26a65c8dd (bug 854421)
Backed out changeset 0d658e89549b (bug 854421)
Backed out changeset 1d4226ea1c1b (bug 854421) for causing bug 1017478