There's no need to preserve the exact callee for lazy bailouts
from JSCallFunction in the AstGraphBuilder, as fullcodegen code
will never look at that value after the callee returns. So we
just push optimized_out instead.

BUG=v8:5267
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2285183002
Cr-Commit-Position: refs/heads/master@{#38963}