Add SkDEBUGFAIL to clean up use of SkASSERT(!"text");
catch a couple of latent SkASSERT("text") bugs.

http://codereview.appspot.com/5504090/



git-svn-id: http://skia.googlecode.com/svn/trunk@2926 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkRegion.cpp b/src/core/SkRegion.cpp
index 334caa8..0a8ab65 100644
--- a/src/core/SkRegion.cpp
+++ b/src/core/SkRegion.cpp
@@ -966,7 +966,7 @@
             return this->setRegion(*rgna);
         break;
     default:
-        SkASSERT(!"unknown region op");
+        SkDEBUGFAIL("unknown region op");
         return !this->isEmpty();
     }