Clarify the logic for when to build an overloaded binop.  In particular,
build one when either of the operands calls itself type-dependent;
previously we were building when one of the operand types was dependent,
which is not always the same thing and which can lead to unfortunate
inconsistencies later.  Fixes PR8739.

llvm-svn: 120990
diff --git a/clang/test/SemaTemplate/enum-argument.cpp b/clang/test/SemaTemplate/enum-argument.cpp
index a79ed84..7d23757 100644
--- a/clang/test/SemaTemplate/enum-argument.cpp
+++ b/clang/test/SemaTemplate/enum-argument.cpp
@@ -30,7 +30,7 @@
     unsigned long long bitfield : e0;
 
     void f(int j) {
-      bitfield + j; // expected-warning {{expression result unused}}
+      bitfield + j;
     }
   };
 }