Security and patch rollup for FPR11 from ESR60

[classilla]

Pending

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Through a23dce703d2b

Not relevant:
M1482425 (not in code)
M1488295 (not enabled)
M1500011 (not in code)
M1503082 (not in code)
M1504452 (no Skia)
M1477773 (not in code)
M1501680 (not in code, and we're pulling out telemetry anyway)
M1490567 (MinGW)
M1490568 (MinGW)
M1490566 (MinGW)
M1491846 (clang)
M1485655 (no Servo)
M1410214 (no WX)
M1493249 (not supported)
M1497549 (not supported)
M1463684 (not supported)
M1493973 (not supported)
M1496736 (Red Hat)
M1486415 (Windows)
M1498765 (not in code)
M1491848 (MinGW)
M1469951 (not supported)
M1507035 (we don't use jemalloc ... but this does fix POWER9)
M1445943 (not supported)
M1500366 (Linux)
M1507564 (no wasm)
M1507730 (no wasm)
M1507614 (don't care)
M1495749 (don't care)

Not taking:
M1503326. If we supported asm.js we'd need this, but we don't and it may impair IonPower optimization of asm.js code.

Deferred:
M1494752 may be needed if we fix issue #533
M1493080 essentially removes mDrawTarget but we don't have M1416862 and it could be slower.
M1502013 should bake in FPR12 beta due to potentially enabling some optimizations. See comment 2 for a slower alternative. https://hg.mozilla.org/releases/mozilla-esr60/rev/a73a46ddc848

Candidates:
M1459891 (this is issue #535)
M1499861 https://hg.mozilla.org/releases/mozilla-esr60/rev/98737ab09270
M1500759 https://hg.mozilla.org/releases/mozilla-esr60/rev/5e1a9644aeef
M1505181 (JS) https://hg.mozilla.org/releases/mozilla-esr60/rev/ee204e26690e (place in jsfun.h)
M1500310 https://hg.mozilla.org/releases/mozilla-esr60/rev/b3a439a26186 (minus structured clone)
M1506640 (JS) https://hg.mozilla.org/releases/mozilla-beta/rev/d4ce8b3cdee8 (jsgc.cpp; SWEEP:, use one-arg traceAllWrappers)
M1507907 https://hg.mozilla.org/releases/mozilla-esr60/rev/8d50553b267a fix uses of CFDateFormatterCreate() in intl/locale/mac/nsDateTimeFormatMac.cpp

[classilla]

Deferring on M1511495 (M1485864) because of sec-moderate and low-risk until I can get more information, since the changes are somewhat involved.

Deferring on M1502530 (we'll update the tzdata again in FPR12 a la #447).