Documentation for LCSE, LICM, Short-Circuit, Global-Splitting

LCSE is local common sub-expression elimination.
LICM is loop invariant code motion.
Short circuit splits basic blocks and introduces early jumps.
Global Splitting is a post regalloc live range splitting pass.

BUG=none
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/2217773003 .
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