Use correct call size for PredictableCodeSizeScopes.

If out-of-line constant pool is enabled, then calls can be 3 instructions
rather than 2.  Fix the hard-coded PredictableCodeSizeScopes values with values
based on CallSize instead.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/226503003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20577 ce2b1a6d-e550-0410-aec6-3dcde31c8c00