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[libFuzzer] Remove InterruptHandler from Fuchsia implementation

Authored by eep on Oct 28 2020, 11:47 PM.

Description

[libFuzzer] Remove InterruptHandler from Fuchsia implementation

As implemented, the InterruptHandler thread was spinning trying to
select() on a null "stdin", wasting a significant amount of CPU for no
benefit. As Fuchsia does not have a native concept of stdin (or POSIX
signals), this commit simply removes this feature entirely.

Reviewed By: aarongreen

Differential Revision: https://reviews.llvm.org/D89266