Fix function declaration for our invocation-ID workaround helper.

Previously, the declaration didn't link back to function definition.
This makes the function appear to be undefined, which inhibits inlining
and also makes it difficult for us to validate the presence of a
definition for every called function.

Change-Id: I220ab502634cb3e1d337c23bac150af9aa6370b1
Bug: skia:10902
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/349063
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
5 files changed