[OpenACC] Fix ast-print of device_type clause

When writing the test for this I seemingly forgot to put 'CHECK' on the
lines, so I didn't notice that I was printing the identifiers as
pointers rather than their names.  This patch corrects the tests and the
print behavior.

clang/lib/AST/OpenACCClause.cpp

@@ -473,7 +473,7 @@ void OpenACCClausePrinter::VisitDeviceTypeClause(
                           if (Arch.first == nullptr)
                             OS << "*";
                           else
-                            OS << Arch.first;
+                            OS << Arch.first->getName();
                         });
   OS << ")";
 }

clang/test/AST/ast-print-openacc-compute-construct.cpp

@@ -111,23 +111,23 @@ void foo() {
   bool SomeB;
   struct SomeStruct{} SomeStructImpl;
 
-//#pragma acc parallel dtype(SomeB)
+//CHECK: #pragma acc parallel dtype(SomeB)
 #pragma acc parallel dtype(SomeB)
   while(true);
 
-//#pragma acc parallel device_type(SomeStruct)
+//CHECK: #pragma acc parallel device_type(SomeStruct)
 #pragma acc parallel device_type(SomeStruct)
   while(true);
 
-//#pragma acc parallel device_type(int)
+//CHECK: #pragma acc parallel device_type(int)
 #pragma acc parallel device_type(int)
   while(true);
 
-//#pragma acc parallel dtype(bool)
+//CHECK: #pragma acc parallel dtype(bool)
 #pragma acc parallel dtype(bool)
   while(true);
 
-//#pragma acc parallel device_type (SomeStructImpl)
+//CHECK: #pragma acc parallel device_type(SomeStructImpl)
 #pragma acc parallel device_type (SomeStructImpl)
   while(true);
 }