[FunctionAttrs] Remove redundant assignment.

Identified by the Clang static analyzer.

llvm-svn: 253661

llvm/lib/Transforms/IPO/FunctionAttrs.cpp

@@ -486,8 +486,6 @@ determinePointerReadAttrs(Argument *A,
         return Attribute::None;
       }
 
-      Captures &= !CS.doesNotCapture(UseIndex);
-
       // Since the optimizer (by design) cannot see the data flow corresponding
       // to a operand bundle use, these cannot participate in the optimistic SCC
       // analysis.  Instead, we model the operand bundle uses as arguments in