This is to fix some of the failing test262 tests with ignition flag.
In few test262 tests, there is a throw from the script scope. Rewriter::Rewrite
pass converts expression statements into assignment statements in script scope.
This causes interpreter to fail because assignment expression expects a result
in accumulator but throw statement does not return a value. To fix this, we
now mark that accumulator contains a value when visiting throw statement.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1523423003

Cr-Commit-Position: refs/heads/master@{#33408}