Revert r158679 - use case is unclear (and it increases the memory footprint).

Original commit message:
    Allow up to 64 functional units per processor itinerary.

    This patch changes the type used to hold the FU bitset from unsigned to uint64_t.
    This will be needed for some upcoming PowerPC itineraries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159027 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/SubtargetEmitter.cpp

@@ -379,8 +379,8 @@ void SubtargetEmitter::EmitStageAndOperandCycleData(raw_ostream &OS,
        << "namespace " << Name << "FU {\n";
 
     for (unsigned j = 0, FUN = FUs.size(); j < FUN; ++j)
-      OS << "  const uint64_t " << FUs[j]->getName()
-         << " = 1ULL << " << j << ";\n";
+      OS << "  const unsigned " << FUs[j]->getName()
+         << " = 1 << " << j << ";\n";
 
     OS << "}\n";