Changes call capture methods generation so that invalid calls no
longer capture pointer params.

Bug: angleproject:4817
Change-Id: I2d83d4d3334da8ba34925f80aed2de859a10fae5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2346749
Commit-Queue: Manh Nguyen <nguyenmh@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>