Check for Background-Hang-Monitor opts in multi-process

[gterzian]

In single-process mode, we only start a BHM if the options has been set:

servo/components/constellation/pipeline.rs

Line 322 in af1ebe7

if opts::get().background_hang_monitor {

But we don't perform this check before starting the BHM in multi-process mode:

servo/components/servo/lib.rs

Line 1019 in b3c12ad

let background_hang_monitor_register =

I think we should. The same opts is available there as well.

[highfive]

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[qrasmont]

@highfive: assign me
Ok first ever contribution, let's have a go!

[highfive]

Hey @qrasmont! Thanks for your interest in working on this issue. It's now assigned to you!

[kunalmohan]

@gterzian Just out of curiosity, what are single-process and multiprocess modes? What does a single process constitute?