Bug 822077; specialise PushRegs for ARM using STM; r=mjrosenb

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extra : rebase_source : f5eeb006a70ed9ef09adc0382943d6c0932615dc
Bug 841180 - Avoid assertion when <text> consists only of undisplayed characters. r=jwatt

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extra : rebase_source : 9751925fdae80ad15168668633d26a72747f7442
Bug 841174 - Handle ::first-letter on a combining mark in SVG text without crashing. r=jwatt

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extra : rebase_source : 9b0b38eccfe1f355996d8e4b4be5dcfc4e00b3be