small fixes to enable the reuse of the pass manager across multiple modules


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171475 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index 1869fe3..0ea9ae0 100644
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -266,7 +266,6 @@
 }
 
 MachineModuleInfo::~MachineModuleInfo() {
-  delete ObjFileMMI;
 }
 
 bool MachineModuleInfo::doInitialization(Module &M) {
@@ -294,6 +293,9 @@
 
   Context.reset();
 
+  delete ObjFileMMI;
+  ObjFileMMI = 0;
+
   return false;
 }