Guard GrOp::dumpInfo with SK_DEBUG

This code was only called from debug code, but was still showing up in
Flutter's release build.

Bug: skia:
Change-Id: I0cba323fc3cb14cfe6daf2388cecf5cf317ac9fa
Reviewed-on: https://skia-review.googlesource.com/c/170268
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
diff --git a/src/gpu/ops/GrAtlasTextOp.cpp b/src/gpu/ops/GrAtlasTextOp.cpp
index bc1b6d0..d2aa33e 100644
--- a/src/gpu/ops/GrAtlasTextOp.cpp
+++ b/src/gpu/ops/GrAtlasTextOp.cpp
@@ -117,6 +117,7 @@
     fProcessors.visitProxies(func);
 }
 
+#ifdef SK_DEBUG
 SkString GrAtlasTextOp::dumpInfo() const {
     SkString str;
 
@@ -133,6 +134,7 @@
     str += INHERITED::dumpInfo();
     return str;
 }
+#endif
 
 GrDrawOp::FixedFunctionFlags GrAtlasTextOp::fixedFunctionFlags() const {
     return FixedFunctionFlags::kNone;