[DebugInfoPDB] Teach Variant to support string types.

The IDiaSymbol::getValue() method returns a variant.  Until now,
I had never encountered a string value, so the Variant wrapper
did not support VT_BSTR.  Now we have need to support string
values, so this patch just adds support for one extra type to
Variant.

llvm-svn: 261152
diff --git a/llvm/lib/DebugInfo/PDB/PDBExtras.cpp b/llvm/lib/DebugInfo/PDB/PDBExtras.cpp
index 29c0c32..52328db 100644
--- a/llvm/lib/DebugInfo/PDB/PDBExtras.cpp
+++ b/llvm/lib/DebugInfo/PDB/PDBExtras.cpp
@@ -284,37 +284,40 @@
 raw_ostream &llvm::operator<<(raw_ostream &OS, const Variant &Value) {
   switch (Value.Type) {
     case PDB_VariantType::Bool:
-      OS << (Value.Bool ? "true" : "false");
+      OS << (Value.Value.Bool ? "true" : "false");
       break;
     case PDB_VariantType::Double:
-      OS << Value.Double;
+      OS << Value.Value.Double;
       break;
     case PDB_VariantType::Int16:
-      OS << Value.Int16;
+      OS << Value.Value.Int16;
       break;
     case PDB_VariantType::Int32:
-      OS << Value.Int32;
+      OS << Value.Value.Int32;
       break;
     case PDB_VariantType::Int64:
-      OS << Value.Int64;
+      OS << Value.Value.Int64;
       break;
     case PDB_VariantType::Int8:
-      OS << static_cast<int>(Value.Int8);
+      OS << static_cast<int>(Value.Value.Int8);
       break;
     case PDB_VariantType::Single:
-      OS << Value.Single;
+      OS << Value.Value.Single;
       break;
     case PDB_VariantType::UInt16:
-      OS << Value.Double;
+      OS << Value.Value.Double;
       break;
     case PDB_VariantType::UInt32:
-      OS << Value.UInt32;
+      OS << Value.Value.UInt32;
       break;
     case PDB_VariantType::UInt64:
-      OS << Value.UInt64;
+      OS << Value.Value.UInt64;
       break;
     case PDB_VariantType::UInt8:
-      OS << static_cast<unsigned>(Value.UInt8);
+      OS << static_cast<unsigned>(Value.Value.UInt8);
+      break;
+    case PDB_VariantType::String:
+      OS << Value.Value.String;
       break;
     default:
       OS << Value.Type;