commit a1ba971cd84a77d077f5fb3389c3f6c66392cdae
author oth <oth@chromium.org> Fri Nov 20 11:17:10 2015
committer Commit bot <commit-bot@chromium.org> Fri Nov 20 11:17:54 2015
tree 44f8adaf9bde27f350a169daf40ea8620856fb8a
parent 0ec6db4750190014d1442a6929808d32ed281f9e

[Interpreter] Enable assignments in expressions.

This change introduces register re-mapping to avoid assignment hazards
in binary expressions. Expressions that cause problems typically have
the form y = x + (x = 4);. The problem occurs because the lhs value
evaluates to the register holding x. The rhs updates that register and
then applying the operation would use the new value as the lhs.

By tracking loads and stores in binary expressions the generator is now
able to detect when condition occurs and uses a temporary register for
the rhs value. When the binary expression evaluation is complete the
variable is updated with the latest temporary.

A new bytecode Mov performs this update without touching the
accumulator.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1412683011

Cr-Commit-Position: refs/heads/master@{#32141}