MachineModuleInfo: Turn nested std::pairs into a proper struct.

llvm-svn: 203414
diff --git a/llvm/lib/CodeGen/MachineModuleInfo.cpp b/llvm/lib/CodeGen/MachineModuleInfo.cpp
index d0ff1e7..7181025 100644
--- a/llvm/lib/CodeGen/MachineModuleInfo.cpp
+++ b/llvm/lib/CodeGen/MachineModuleInfo.cpp
@@ -313,7 +313,7 @@
   CallsEHReturn = 0;
   CallsUnwindInit = 0;
   CompactUnwindEncoding = 0;
-  VariableDbgInfo.clear();
+  VariableDbgInfos.clear();
 }
 
 /// AnalyzeModule - Scan the module for global debug information.