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Technically makes a few behavioral changes, but these shouldn't have
any real consequences:

1. When comparing conditional branch statements, the 'false' jump
target is now compared lexicographically before the 'true' jump target
(to reduce redundancy with comparing unconditional branches).  This
affects block ordering slightly, but equality (which is what we really
care about) remains the same.

2. Adds a bit more sanity checking: RET and JMP instructions should
only occur at the end of basic blocks.

Review URL: https://codereview.chromium.org/286063007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271593 0039d316-1c4b-4281-b951-d872f2087c98