Version 4.4.42

MIPS: Fix FP load/store with large offsets from base register (Chromium issue 481519).

Extending v8::GetHeapStatistics to return total available size (Chromium issue 476013).

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/4.4.42@{#1}
Cr-Branched-From: 29bee160-refs/heads/master@{#28117}