Revert "Revert "Redo range check in CPDF_SampledFunc::v_Call().""

This reverts commit 327080bacabb3d90094144e66ae57037d4a8d8e6.
This re-lands the patch, but removes the tests which would require
512MB buffers to be reliably allocatable on small bots. It
also adds
small fixes accumulated while diagnosing it.

R=sanqingsong@gmail.com

Review URL: https://codereview.chromium.org/1214403002.