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V8 is starting to use guard regions and a signal handler to do out of bounds
checks for WebAssembly. This means out of bounds accesses will trigger a
segmentation fault, but V8 is able to recover from these and throw a Javascript
exception instead. In order to do this, V8 needs to cooperate with any existing
signal handlers.

This CL modifies Chromium's signal handlers to call V8's TryHandleSignal
function before taking any other actions so that V8 is able to recover from the
faults it expects.

BUG= chromium:722585, v8:5277

Review-Url: https://codereview.chromium.org/2885053005
Cr-Commit-Position: refs/heads/master@{#487549}