GetSharedFunctionInfo will compile inner functions if we get the
compile-eager hint, even if the shared function info already exists, and
the function already has been compiled. This breaks suspended generator
objects.

R=mstarzinger@chromium.org, neis@chromium.org
BUG=v8:5575

Review-Url: https://codereview.chromium.org/2494043002
Cr-Commit-Position: refs/heads/master@{#40936}