[llvm] Fix the MCSubtargetInfo used for module-level assembly.

Provide both the default target CPU and default target features from the
module's context, rather than empty strings.

Fixes llvm#61991.

Author: chrisnc

llvm/lib/Object/ModuleSymbolTable.cpp

@@ -22,6 +22,7 @@
 #include "llvm/IR/GlobalValue.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/InlineAsm.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
@@ -92,8 +93,11 @@ initializeRecordStreamer(const Module &M,
   if (!MAI)
     return;
 
+  LLVMContext &Context = M.getContext();
+
   std::unique_ptr<MCSubtargetInfo> STI(
-      T->createMCSubtargetInfo(TT.str(), "", ""));
+      T->createMCSubtargetInfo(TT.str(), Context.getDefaultTargetCPU(),
+                               Context.getDefaultTargetFeatures()));
   if (!STI)
     return;