This is a first prototype for a rudimentary inlining heuristic allowing
enabling of general inlining based existing budget flags. Also note that
this approach does not yet work for multi-level inlining, for now the
list of candidates is processed exactly once.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1406543002

Cr-Commit-Position: refs/heads/master@{#31249}