Reviewers: Benedikt Meurer, jarin,

Description:
Unit tests for the live range conflict detection mechanism (CoalescedLiveRanges)
in the Greedy Allocator.

Consolidated conflict detection and traversal logic in CoalescedLiveRanges to avoid duplication in both code and testing. In addition, this change achieves
better separation between CoalescedLiveRanges and other register allocator
components, improving testability and maintainability.


BUG=

Please review this at https://codereview.chromium.org/1219063017/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+383, -93 lines):
  M src/compiler/coalesced-live-ranges.h
  M src/compiler/coalesced-live-ranges.cc
  M src/compiler/greedy-allocator.h
  M src/compiler/greedy-allocator.cc
  M src/compiler/register-allocator.h
  A test/unittests/compiler/coalesced-live-ranges-unittest.cc
  M test/unittests/unittests.gyp


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