TableGen: use fully qualified name for StringLiteral

Use the qualified name for StringLiteral (llvm::StringLiteral) when
generating the sources.  This is needed as the generated files may be
used out-of-tree (e.g. swift) where you may not have a
`using namespace llvm;` resulting in an undefined lookup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293577 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/IntrinsicEmitter.cpp

@@ -133,13 +133,13 @@ void IntrinsicEmitter::EmitTargetInfo(const CodeGenIntrinsicTable &Ints,
   OS << "// Target mapping\n";
   OS << "#ifdef GET_INTRINSIC_TARGET_DATA\n";
   OS << "struct IntrinsicTargetInfo {\n"
-     << "  StringLiteral Name;\n"
+     << "  llvm::StringLiteral Name;\n"
      << "  size_t Offset;\n"
      << "  size_t Count;\n"
      << "};\n";
   OS << "static constexpr IntrinsicTargetInfo TargetInfos[] = {\n";
   for (auto Target : Ints.Targets)
-    OS << "  {StringLiteral(\"" << Target.Name << "\"), " << Target.Offset
+    OS << "  {llvm::StringLiteral(\"" << Target.Name << "\"), " << Target.Offset
        << ", " << Target.Count << "},\n";
   OS << "};\n";
   OS << "#endif\n\n";