We actually handle AllocaInst via getRegForValue below just fine.

Part of rdar://8905263

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152845 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/FastISel.cpp

@@ -583,7 +583,7 @@ bool FastISel::SelectCall(const User *I) {
     }
 
     const Value *Address = DI->getAddress();
-    if (!Address || isa<UndefValue>(Address) || isa<AllocaInst>(Address)) {
+    if (!Address || isa<UndefValue>(Address)) {
       DEBUG(dbgs() << "Dropping debug info for " << *DI << "\n");
       return true;
     }