Prevent warnings on compilers for which its not clear that assert won't return.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81044 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ProfileVerifierPass.cpp

@@ -167,6 +167,7 @@ double ProfileVerifierPass::ReadOrAssert(ProfileInfo::Edge E) {
       return 0;
     } else { 
       assert(0 && Message);
+      return 0;
     }
   } else {
     return EdgeWeight;