Move VariableDbgInfo from MachineModuleInfo to MachineFunction

VariableDbgInfo is per function data, so it makes sense to have it with
the function instead of the module.

This is a necessary step to have machine module passes work properly.

Differential Revision: https://reviews.llvm.org/D27186

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288292 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineModuleInfo.cpp

@@ -240,7 +240,6 @@ void MachineModuleInfo::EndFunction() {
   CallsEHReturn = false;
   CallsUnwindInit = false;
   HasEHFunclets = false;
-  VariableDbgInfos.clear();
 }
 
 //===- Address of Block Management ----------------------------------------===//