Added the initialization of IndexContents in MemIndex.

Author: zahiraam

clang-tools-extra/clangd/index/MemIndex.h

@@ -93,7 +93,7 @@ class MemIndex : public SymbolIndex {
   // Set of files which were used during this index build.
   llvm::StringSet<> Files;
   // Contents of the index (symbols, references, etc.)
-  IndexContents IdxContents;
+  IndexContents IdxContents = IndexContents::None;
   std::shared_ptr<void> KeepAlive; // poor man's move-only std::any
   // Size of memory retained by KeepAlive.
   size_t BackingDataSize = 0;