Different fix for gcc bug

Was still running into

from definition of 'template<class T> struct llvm::DenseMapInfo'
[-fpermissive]
 template <typename T> struct DenseMapInfo;
                               ^

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -82,8 +82,9 @@ using namespace llvm::XCOFF;
 // std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind> in DenseMap.
 // This specialization is needed here because that type is used as keys in the
 // map representing TOC entries.
+namespace llvm {
 template <>
-struct llvm::DenseMapInfo<std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind>> {
+struct DenseMapInfo<std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind>> {
   using TOCKey = std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind>;
 
   static inline TOCKey getEmptyKey() {
@@ -99,6 +100,7 @@ struct llvm::DenseMapInfo<std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKi
   }
   static bool isEqual(const TOCKey &A, const TOCKey &B) { return A == B; }
 };
+} // end namespace llvm
 
 namespace {