Repair an out by one error for IA64.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22942 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/IA64/IA64ISelPattern.cpp b/lib/Target/IA64/IA64ISelPattern.cpp
index a0a6f70..b66a032 100644
--- a/lib/Target/IA64/IA64ISelPattern.cpp
+++ b/lib/Target/IA64/IA64ISelPattern.cpp
@@ -875,7 +875,7 @@
   int64_t v = (int64_t)cast<ConstantSDNode>(N)->getSignExtended();
 
   if (isMask_64(v)) { // if ANDing with ((2^n)-1) for some n
-    Imm = Log2_64(v);
+    Imm = Log2_64(v) + 1;
     return 1; // say so
   }