Fix Windows build using portable types for formatting the log outputs

llvm-svn: 202723
diff --git a/lldb/source/DataFormatters/LibCxxUnorderedMap.cpp b/lldb/source/DataFormatters/LibCxxUnorderedMap.cpp
index 99cd08e..bf68f20 100644
--- a/lldb/source/DataFormatters/LibCxxUnorderedMap.cpp
+++ b/lldb/source/DataFormatters/LibCxxUnorderedMap.cpp
@@ -81,7 +81,7 @@
     if (!val_hash.first)
         return lldb::ValueObjectSP();
     StreamString stream;
-    stream.Printf("[%zu]",idx);
+    stream.Printf("[%" PRIu64 "]", (uint64_t)idx);
     DataExtractor data;
     Error error;
     val_hash.first->GetData(data, error);