Fix a build problem with xlc. The error message was

"../llvm-git/utils/TableGen/CodeGenSchedule.cpp", line 1594.12: 1540-0218 (S) The call does not match any parameter list for "operator+".
"../llvm-git/include/llvm/ADT/STLExtras.h", line 130.1: 1540-1283 (I) "template <class _Iterator, class Func> llvm::operator+(mapped_iterator<_Iterator,Func>::difference_type, const mapped_iterator<_Iterator,Func> &)" is not a viable candidate.

Patch by Kai.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167311 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/SubtargetEmitter.cpp b/utils/TableGen/SubtargetEmitter.cpp
index 806bda1..f1a06bb 100644
--- a/utils/TableGen/SubtargetEmitter.cpp
+++ b/utils/TableGen/SubtargetEmitter.cpp
@@ -1053,7 +1053,7 @@
       continue;
 
     std::vector<MCSchedClassDesc> &SCTab =
-      SchedTables.ProcSchedClasses[1 + PI - SchedModels.procModelBegin()];
+      SchedTables.ProcSchedClasses[1 + (PI - SchedModels.procModelBegin())];
 
     OS << "\n// {Name, NumMicroOps, BeginGroup, EndGroup,"
        << " WriteProcResIdx,#, WriteLatencyIdx,#, ReadAdvanceIdx,#}\n";