Actually test our ref-counting in release builds

BUG=skia:

Change-Id: I8df5c84bf961a3be68a642ba338fdc641e09df59
Reviewed-on: https://skia-review.googlesource.com/8889
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/tests/RefCntTest.cpp b/tests/RefCntTest.cpp
index d5be621..4bad342 100644
--- a/tests/RefCntTest.cpp
+++ b/tests/RefCntTest.cpp
@@ -25,8 +25,8 @@
     SkThread thing1(bounce_ref, ref);
     SkThread thing2(bounce_ref, ref);
 
-    SkASSERT(thing1.start());
-    SkASSERT(thing2.start());
+    SkAssertResult(thing1.start());
+    SkAssertResult(thing2.start());
 
     thing1.join();
     thing2.join();
@@ -60,10 +60,10 @@
     SkThread thing3(bounce_weak_ref, ref);
     SkThread thing4(bounce_weak_weak_ref, ref);
 
-    SkASSERT(thing1.start());
-    SkASSERT(thing2.start());
-    SkASSERT(thing3.start());
-    SkASSERT(thing4.start());
+    SkAssertResult(thing1.start());
+    SkAssertResult(thing2.start());
+    SkAssertResult(thing3.start());
+    SkAssertResult(thing4.start());
 
     thing1.join();
     thing2.join();