Use correct call size for PredictableCodeSizeScopes.

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

Committed: https://code.google.com/p/v8/source/detail?r=20577

[rmcilroy, 2014-04-08 11:43:50]

Last fix required before ool constant pool can run cleanly through the check
tests.  PTAL.

[ulan, 2014-04-08 12:18:52]

lgtm

[rmcilroy, 2014-04-08 12:28:37]

Committed patchset #1 manually as r20577 (presubmit successful).