Used the cached subtarget off of the MachineFunction.

llvm-svn: 230078
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 4aa12ed..eb4df82 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1176,7 +1176,7 @@
   Asm->OutStreamer.EmitLabel(FunctionBeginSym);
 
   // Calculate history for local variables.
-  calculateDbgValueHistory(MF, Asm->TM.getSubtargetImpl()->getRegisterInfo(),
+  calculateDbgValueHistory(MF, Asm->MF->getSubtarget().getRegisterInfo(),
                            DbgValues);
 
   // Request labels for the full history.