[Attributor][NFCI] Remove unneeded namespace

llvm/lib/Transforms/IPO/AttributorAttributes.cpp

@@ -141,8 +141,6 @@ PIPE_OPERATOR(AAFunctionReachability)
 #undef PIPE_OPERATOR
 } // namespace llvm
 
-namespace {
-
 /// Get pointer operand of memory accessing instruction. If \p I is
 /// not a memory accessing instruction, return nullptr. If \p AllowVolatile,
 /// is set to false and the instruction is volatile, return nullptr.
@@ -6468,8 +6466,6 @@ void AAMemoryBehaviorFloating::analyzeUseIn(Attributor &A, const Use *U,
     removeAssumedBits(NO_WRITES);
 }
 
-} // namespace
-
 /// -------------------- Memory Locations Attributes ---------------------------
 /// Includes read-none, argmemonly, inaccessiblememonly,
 /// inaccessiblememorargmemonly