When checking for marking a function for optimization, we had a check if
the function is already optimized to return early. This works in non-OSR
cases. For Turbofan OSR even when the current execution of the function
has already been optimized, the function itself will not be replaced
with optimized code. Hence, we may end up checking a function that is
already marked for optimization again. A check for the frame being optimized
avoids these checks.

BUG=

Review-Url: https://codereview.chromium.org/2450233002
Cr-Commit-Position: refs/heads/master@{#40760}