Adds block-level coverage tracking for binary && and ||
expressions. Introduces a BinaryOperation source-range
for tracking the operations themselves and an Expression
source-range, used for tracking NaryLogical expressions.

This builds on work by jgruber@chromium.org in
the issue.

TBR=marja@chromium.org
R=jgruber@chromium.org, rmcilroy@chromium.org

Bug: v8:6660
Change-Id: I83a81f13a3514a734c06948b2d3e91138fb00e18
Reviewed-on: https://chromium-review.googlesource.com/754564
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49304}