merge from mainline

Fix PR4772 ARM JIT.GlobalInFuction unittest by explicitly initialize MMI 
to 0 during JITEmitter constructor.


git-svn-id: http://llvm.org/svn/llvm-project/llvm/branches/release_26@80550 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/JIT/JITEmitter.cpp

@@ -504,7 +504,7 @@ namespace {
 
   public:
     JITEmitter(JIT &jit, JITMemoryManager *JMM)
-        : SizeEstimate(0), Resolver(jit), CurFn(0) {
+        : SizeEstimate(0), Resolver(jit), MMI(0), CurFn(0) {
       MemMgr = JMM ? JMM : JITMemoryManager::CreateDefaultMemManager();
       if (jit.getJITInfo().needsGOT()) {
         MemMgr->AllocateGOT();