Fixes PR8823: add-with-overflow-128.ll
In the bottom-up selection DAG scheduling, handle two-address
instructions that read/write unspillable registers. Treat
the entire chain of two-address nodes as a single live range.

llvm-svn: 122472
diff --git a/llvm/test/CodeGen/Generic/add-with-overflow-128.ll b/llvm/test/CodeGen/Generic/add-with-overflow-128.ll
index a122251..33f44d6 100644
--- a/llvm/test/CodeGen/Generic/add-with-overflow-128.ll
+++ b/llvm/test/CodeGen/Generic/add-with-overflow-128.ll
@@ -1,6 +1,4 @@
-; RUN: true
-; FIXME: TEmporarily disabled: PR8823
-; llc < %s
+; RUN: llc < %s
 
 @ok = internal constant [4 x i8] c"%d\0A\00"
 @no = internal constant [4 x i8] c"no\0A\00"