Suppress int overflow warning in matrixProcs

Clamping it caused too much of a performance impact in
https://skia-review.googlesource.com/c/skia/+/579116

We believe it to be safe, so we are suppressing it.

Change-Id: I7ac5a0e085dfe1e93698b9b0fb91c2cff2602985
Bug: 1357122
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/579116
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
2 files changed