Undo call-count fix for intrinsic functions.

This CL is conceptually a revert of http://review.skia.org/320258,
although the code has changed shape a bit since that CL was landed.

This fix was too aggressive, and can lead to functions being dead-
stripped while they still have an active reference.

Change-Id: I6ce8b0ad9cc2a42e8be8cb10d3a8219149eca6aa
Bug: skia:10776
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/325462
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
92 files changed