Fix reference to temporary in GM

Changes variable from constexpr to const so it has an address.

Bug: skia:13590
Change-Id: Idf5bf3834ac4335d1228eeecbfabb0eeecb12f42
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/563120
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed